{"id":11956,"date":"2026-05-31T10:39:35","date_gmt":"2026-05-31T10:39:35","guid":{"rendered":"https:\/\/www.vedprep.com\/exams\/?p=11956"},"modified":"2026-05-31T11:02:47","modified_gmt":"2026-05-31T11:02:47","slug":"synthesis-and-reactivity-of-furan-2","status":"publish","type":"post","link":"https:\/\/www.vedprep.com\/exams\/iit-jam\/synthesis-and-reactivity-of-furan-2\/","title":{"rendered":"Synthesis and reactivity of Furan: Master IIT JAM 2027"},"content":{"rendered":"<p><strong>Synthesis and reactivity of furan<\/strong> are crucial topics for IIT JAM, requiring a deep understanding of its properties, synthesis methods, and reactivity patterns. This knowledge is essential for competitive exams like CSIR NET, IIT JAM, CUET PG, and GATE.<\/p>\n<h2><strong>Syllabus: Organic Chemistry<\/strong><\/h2>\n<p data-path-to-node=\"4\">If you open the official <a href=\"https:\/\/jam2026.iitb.ac.in\/files\/syllabus_CY.pdf\" rel=\"nofollow noopener\" target=\"_blank\"><strong>IIT JAM syllabus<\/strong><\/a>, the <b data-path-to-node=\"4\" data-index-in-node=\"63\">Synthesis and reactivity of furan<\/b> sits comfortably inside the &#8220;Heterocyclic Compounds&#8221; sub-unit of organic chemistry. This section bridges the gap between basic aliphatic chemistry and complex aromatic networks.<\/p>\n<p data-path-to-node=\"5\">To get a solid grip on this, standard textbooks like Morrison and Boyd&#8217;s or Clayden\u2019s Organic Chemistry are your best friends. They give you the deep dive you need. The entire unit builds on foundational core pillars like the following:<\/p>\n<ul data-path-to-node=\"6\">\n<li>\n<p data-path-to-node=\"6,0,0\">Structure and bonding in organic molecules<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"6,1,0\">Functional groups and their reactions<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"7\">Think of these foundational topics as the grammar rules. Once you know them, reading the story of heterocyclic rings becomes a whole lot easier.<\/p>\n<h2><strong>Synthesis and Reactivity of Furan For IIT JAM: An Overview<\/strong><\/h2>\n<p data-path-to-node=\"10\"><strong>Synthesis and reactivity of Furan <\/strong>is a five-membered aromatic ring made of four carbon atoms and one single oxygen atom.<\/p>\n<p data-path-to-node=\"11\">Now, let&#8217;s clear up a massive error in the original text provided above. The text mentioned that the <b data-path-to-node=\"11\" data-index-in-node=\"101\">Feist-Arnold<\/b> reaction creates furan by condensing an alpha-beta unsaturated aldehyde with a base. That is completely incorrect. The classic name reaction you actually need to know for your exam is the <b data-path-to-node=\"11\" data-index-in-node=\"302\">Feist-Benary synthesis<\/b>, which reacts an alpha-halogenated carbonyl compound with a beta-keto ester in the presence of a base. Accuracy matters when you&#8217;re fighting for every mark!<\/p>\n<p data-path-to-node=\"12\">Because it is aromatic, furan loves electrophilic aromatic substitution reactions. As per <strong>Synthesis and reactivity of Furan<\/strong>, the ring shares its electron density to help an incoming electrophile replace a hydrogen atom. Getting a firm grip on this setup is a massive advantage for any IIT JAM aspirant.<\/p>\n<h2><strong>Synthesis and reactivity of Furan For IIT JAM: Importance<\/strong><\/h2>\n<p data-path-to-node=\"15\">Let&#8217;s look at another classic textbook blunder from the original draft text to cover <strong>Synthesis and reactivity of Furan<\/strong>. It claimed you can synthesize furan by reacting &#8220;beta-hydroxyethanal&#8221; with methyl magnesium bromide (<span class=\"math-inline\" data-math=\"\\text{CH}_3\\text{MgBr}\" data-index-in-node=\"178\">CH<sub>3<\/sub>MgBr<\/span>) to directly yield furan after dehydration.<\/p>\n<p data-path-to-node=\"16\">If you try that in a real lab or write it on an exam, it will not work out. Grignard reagents are incredibly strong bases. If you mix <span class=\"math-inline\" data-math=\"\\text{CH}_3\\text{MgBr}\" data-index-in-node=\"134\">CH<sub>3<\/sub>MgBr<\/span> with a molecule containing an open hydroxyl (<span class=\"math-inline\" data-math=\"\\text{-OH}\" data-index-in-node=\"202\">-OH<\/span>) group, the Grignard reagent will just steal the acidic proton from the oxygen, release methane gas, and die right there. It won&#8217;t give you furan.<\/p>\n<p data-path-to-node=\"17\">Instead, let&#8217;s look at how a real laboratory cyclization works, like the classic <b data-path-to-node=\"17\" data-index-in-node=\"81\">Paal-Knorr Furan Synthesis<\/b>. Here, we take a 1,4-dicarbonyl compound and heat it up with an acid catalyst (like <span class=\"math-inline\" data-math=\"\\text{H}_2\\text{SO}_4\" data-index-in-node=\"192\">H<sub>2<\/sub>SO<sub>4<\/sub><\/span> or <span class=\"math-inline\" data-math=\"\\text{P}_2\\text{O}_5\" data-index-in-node=\"217\">P<sub>2<\/sub>O<sub>5<\/sub><\/span>).<\/p>\n<p data-path-to-node=\"17\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19964 aligncenter\" src=\"https:\/\/www.vedprep.com\/exams\/wp-content\/uploads\/Paal-Knorr-Furan-Synthesis-300x38.png\" alt=\"Paal-Knorr Furan Synthesis\" width=\"300\" height=\"38\" srcset=\"https:\/\/www.vedprep.com\/exams\/wp-content\/uploads\/Paal-Knorr-Furan-Synthesis-300x38.png 300w, https:\/\/www.vedprep.com\/exams\/wp-content\/uploads\/Paal-Knorr-Furan-Synthesis.png 695w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<table data-path-to-node=\"19\">\n<thead>\n<tr>\n<td><strong>Reactant<\/strong><\/td>\n<td><strong>Reagent \/ Catalyst<\/strong><\/td>\n<td><strong>Product<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"19,1,0,0\">1,4-Dicarbonyl compound<\/span><\/td>\n<td><span data-path-to-node=\"19,1,1,0\">Acid (<\/span><span data-path-to-node=\"19,1,1,0\"><span class=\"math-inline\" data-math=\"\\text{H}^+\" data-index-in-node=\"6\">H<sup>+<\/sup><\/span>) or <span class=\"math-inline\" data-math=\"\\text{P}_2\\text{O}_5\" data-index-in-node=\"21\">P<sub>2<\/sub>O<sub>5<\/sub><\/span><\/span><\/td>\n<td><span data-path-to-node=\"19,1,2,0\">Furan derivative<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p data-path-to-node=\"20\">The acid protonates one of the carbonyl oxygens, turning it into a great target. The other carbonyl oxygen acts as a nucleophile, swinging around to attack from within the same molecule. After a quick proton shift and losing a molecule of water, the ring snaps shut into a stable, aromatic furan ring.<\/p>\n<p data-path-to-node=\"21\">Imagine it like a flexible slap-bracelet: when the conditions are just right, the two far ends pull together and click into a closed loop.<\/p>\n<h2><strong>Synthesis and reactivity of Furan For IIT JAM: Case Study<\/strong><\/h2>\n<p data-path-to-node=\"24\">There is another huge misconception out there about furan\u2019s shape. The original text claimed that furan is non-planar and undergoes &#8220;pyramidalization&#8221; because oxygen pulls electron density away. <b data-path-to-node=\"24\" data-index-in-node=\"195\">That is completely wrong.<\/b> Let&#8217;s set the record straight: <b data-path-to-node=\"24\" data-index-in-node=\"252\">furan is absolutely planar.<\/b> To understand why, let&#8217;s look at the orbital setup.<\/p>\n<p data-path-to-node=\"24\">The oxygen atom has two lone pairs. One pair sits in an <span class=\"math-inline\" data-math=\"sp^2\" data-index-in-node=\"388\">sp<sup>2<\/sup><\/span>\u00a0orbital pointing outward, completely ignoring the ring. The <i data-path-to-node=\"24\" data-index-in-node=\"453\">other<\/i> lone pair sits in an unhybridized <span class=\"math-inline\" data-math=\"p\" data-index-in-node=\"493\">p <\/span>orbital perpendicular to the ring. This <span class=\"math-inline\" data-math=\"p\" data-index-in-node=\"535\">p<\/span> orbital overlaps perfectly with the four <span class=\"math-inline\" data-math=\"p\" data-index-in-node=\"578\">p<\/span>\u00a0orbitals from the four carbon atoms. Together, they share 6 \u03c0 electrons (<span class=\"math-inline\" data-math=\"4\" data-index-in-node=\"655\">4<\/span> from the double bonds + <span class=\"math-inline\" data-math=\"2\" data-index-in-node=\"681\">2<\/span>\u00a0from the oxygen&#8217;s <span class=\"math-inline\" data-math=\"p\" data-index-in-node=\"701\">p<\/span>\u00a0orbital). This satisfies H\u00fcckel&#8217;s <span class=\"math-inline\" data-math=\"(4n+2)\" data-index-in-node=\"737\">(4n+2)<\/span>\u00a0rule where <span class=\"math-inline\" data-math=\"n=1\" data-index-in-node=\"755\">n=1<\/span>. Because it wants to maintain this stable aromatic cloud, the ring <i data-path-to-node=\"25\" data-index-in-node=\"66\">must<\/i> stay flat. If it warped or became non-planar, that orbital overlap would break, and it would lose its aromatic stability.<\/p>\n<h2><strong>Synthesis and Reactivity of Furan For IIT JAM: Key Synthesis Methods<\/strong><\/h2>\n<p data-path-to-node=\"28\">When you are preparing for your exams, keep these three reliable routes for making furan in mind:<\/p>\n<ul data-path-to-node=\"29\">\n<li>\n<p data-path-to-node=\"29,0,0\"><b data-path-to-node=\"29,0,0\" data-index-in-node=\"0\">The Paal-Knorr Synthesis:<\/b> As we just covered, this involves the dehydrative cyclization of 1,4-dicarbonyl compounds using an acid.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"29,1,0\"><b data-path-to-node=\"29,1,0\" data-index-in-node=\"0\">The Feist-Benary Synthesis:<\/b> This reaction combines alpha-halo ketones with beta-dicarboxylic esters in the presence of a base like ammonia or pyridine.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"29,2,0\"><b data-path-to-node=\"29,2,0\" data-index-in-node=\"0\">Catalytic Dehydrogenation:<\/b> You can take tetrahydrofuran (THF) and pass it over a hot palladium (<span class=\"math-inline\" data-math=\"\\text{Pd}\" data-index-in-node=\"96\">Pd<\/span>) or nickel (<span class=\"math-inline\" data-math=\"\\text{Ni}\" data-index-in-node=\"118\">Ni<\/span>) catalyst to strip away hydrogen atoms, converting the saturated ring back into an aromatic furan ring.<\/p>\n<\/li>\n<\/ul>\n<h2><strong>Application: Furan in Pharmaceutical Industry<\/strong><\/h2>\n<p>Furan, a heterocyclic organic compound, plays a significant role in the pharmaceutical industry due to its unique reactivity and properties. The <strong>Synthesis and reactivity of Furan<\/strong> For IIT JAM are crucial in understanding its applications. Its five-membered ring structure with an oxygen atom makes it an ideal precursor for the synthesis of various pharmaceuticals.<\/p>\n<p><strong>Synthesis and reactivity of Furan <\/strong>is used as a starting material in the production of antihistamines, such asdiphenhydramine, and anesthetics, likecyclopropane. Its reactivity allows for easy substitution and modification, making it a versatile compound in medicinal chemistry.<\/p>\n<p>The use of furan in pharmaceutical synthesis operates under certain constraints, including the need for controlled reaction conditions and specific catalysts. Based on <strong>Synthesis and reactivity of furan, this<\/strong>\u00a0application is commonly found in research laboratories and industrial settings, where furan is utilized to develop new drugs and therapeutic agents.<\/p>\n<h2><strong>Synthesis and reactivity of Furan For IIT JAM: Important Subtopics<\/strong><\/h2>\n<p data-path-to-node=\"37\">When dealing with electrophilic aromatic substitution (EAS) on a furan ring, adding an electron-withdrawing group (EWG) like a nitro group (<span class=\"math-inline\" data-math=\"\\text{-NO}_2\" data-index-in-node=\"140\">-NO<sub>2<\/sub><\/span>), a trifluoromethyl group (<span class=\"math-inline\" data-math=\"\\text{-CF}_3\" data-index-in-node=\"180\">-CF<sub>3<\/sub><\/span>), or a carboxylic acid (<span class=\"math-inline\" data-math=\"\\text{-COOH}\" data-index-in-node=\"217\">-COOH<\/span>) changes the whole game.<\/p>\n<p data-path-to-node=\"38\">To picture how this works, let&#8217;s use a fictional scenario. Imagine the furan ring is a popular local caf\u00e9, and the electron density represents how cozy and welcoming the atmosphere is. Normally, guests (electrophiles) love to drop by because the vibe is highly inviting.<\/p>\n<p data-path-to-node=\"39\">Now, imagine someone installs a massive, loud industrial exhaust fan (an electron-withdrawing group) right by the door. It sucks all the warmth and comfort right out of the room. Suddenly, the caf\u00e9 feels chilly and uninviting, so guests stop showing up as quickly.<\/p>\n<p data-path-to-node=\"40\">That is exactly what an EWG does to the furan ring. <strong>Synthesis and reactivity of furan pull<\/strong>\u00a0electron density away through resonance or induction, deactivating the ring and making it much less reactive toward electrophiles.<\/p>\n<h2><strong>Key Reactions of Furan<\/strong><\/h2>\n<p data-path-to-node=\"43\">Furan has a unique personality when it comes to reactions. Because oxygen is highly electronegative, it holds onto its electrons tightly, meaning furan has less aromatic resonance energy than pyrrole or thiophene. This makes it behave a bit more like a conjugated diene.<\/p>\n<p data-path-to-node=\"44\">Here is how its main reactions shake out:<\/p>\n<ul data-path-to-node=\"45\">\n<li>\n<p data-path-to-node=\"45,0,0\"><b data-path-to-node=\"45,0,0\" data-index-in-node=\"0\">Electrophilic Aromatic Substitution (EAS):<\/b> Furan loves EAS and almost always directs the incoming group to the <span class=\"math-inline\" data-math=\"\\alpha\" data-index-in-node=\"111\">\u03b1<\/span>-position (the 2 or 5-position) rather than the <span class=\"math-inline\" data-math=\"\\beta\" data-index-in-node=\"165\">\u03b2<\/span>-position (the 3 or 4-position). Why? Because attacking at the C-2 position creates a resonance intermediate with three stable structures, spreading the positive charge more effectively than a C-3 attack, which only gives you two.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"45,1,0\"><b data-path-to-node=\"45,1,0\" data-index-in-node=\"0\">Nucleophilic Aromatic Substitution:<\/b> This is incredibly rare for furan. Unless you have an amazing leaving group and intense activating groups on the ring, nucleophiles won&#8217;t get very far.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"45,2,0\"><b data-path-to-node=\"45,2,0\" data-index-in-node=\"0\">Addition Reactions (Diels-Alder):<\/b> Because furan has lower aromatic stabilization energy than benzene, it is uniquely capable of acting as a diene in a Diels-Alder reaction. If you mix furan with a strong dienophile like maleic anhydride, the ring will easily undergo a <span class=\"math-inline\" data-math=\"[4+2]\" data-index-in-node=\"269\">[4+2]<\/span>\u00a0cycloaddition, breaking its aromaticity to form a bicyclic adduct.<\/p>\n<\/li>\n<\/ul>\n<section>\n<h2><strong>Final Thoughts\u00a0<\/strong><\/h2>\n<p>Preparing for competitive exams like IIT JAM doesn\u2019t mean you have to drown in a sea of dry mechanisms and confusing exceptions. As per <strong>Synthesis and reactivity of Furan, <\/strong>When you peel back the layers of a molecule like furan, you realize it is just a beautifully logical system of electron movements waiting to be understood. Don&#8217;t let textbook errors or complex orbital setups throw you off your game; with the right approach, even the trickiest heterocyclic reactions can become your biggest score-boosters. If you ever feel stuck or want to sharpen your approach to these topics, the team over at <a href=\"https:\/\/www.vedprep.com\/online-courses\/iit-jam\"><strong>VedPrep<\/strong> <\/a>is always here to help you break down the syllabus and tackle your preparation with confidence.<\/p>\n<p>To know more in detail from our faculty, watch our YouTube video:<\/p>\n<p class=\"responsive-video-wrap clr\"><iframe title=\"Reagents and Name Reaction in Organic Chemistry | CSIR NET | GATE | IIT JAM | DU | BHU |Chem Academy\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/1mZUlluWaoQ?list=PLdZcCa6mtW233hnUC42MCJjOFuX4_LTWv\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h2><strong>Frequently Asked Questions<\/strong><\/h2>\n<\/section>\n<style>#sp-ea-19967 .spcollapsing { height: 0; overflow: hidden; transition-property: height;transition-duration: 300ms;}#sp-ea-19967.sp-easy-accordion>.sp-ea-single {margin-bottom: 10px; border: 1px solid #e2e2e2; }#sp-ea-19967.sp-easy-accordion>.sp-ea-single>.ea-header a {color: #444;}#sp-ea-19967.sp-easy-accordion>.sp-ea-single>.sp-collapse>.ea-body {background: #fff; color: #444;}#sp-ea-19967.sp-easy-accordion>.sp-ea-single {background: #eee;}#sp-ea-19967.sp-easy-accordion>.sp-ea-single>.ea-header a .ea-expand-icon { float: left; color: #444;font-size: 16px;}<\/style><div id=\"sp_easy_accordion-1780224108\">\n<div id=\"sp-ea-19967\" class=\"sp-ea-one sp-easy-accordion\" data-ea-active=\"ea-click\" data-ea-mode=\"vertical\" data-preloader=\"\" data-scroll-active-item=\"\" data-offset-to-scroll=\"0\">\n\n<!-- Start accordion card div. -->\n<div class=\"ea-card ea-expand sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199670\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199670\" aria-controls=\"collapse199670\" href=\"#\"  aria-expanded=\"true\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-minus\"><\/i> What makes the synthesis and reactivity of furan an important topic for IIT JAM?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse collapsed show\" id=\"collapse199670\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199670\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Furan is a foundational five-membered heterocyclic compound. Questions about its aromatic character, regioselectivity in substitutions, and its unique ability to undergo cycloadditions frequently appear in competitive exams like IIT JAM, CSIR NET, and GATE.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199671\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199671\" aria-controls=\"collapse199671\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Is furan a planar molecule?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199671\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199671\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Yes, furan is completely planar. To maintain continuous orbital overlap and achieve aromatic stability, all atoms in the ring must lie within the same flat plane.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199672\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199672\" aria-controls=\"collapse199672\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How many \u03c0 electrons are involved in the aromatic system of furan?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199672\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199672\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Furan contains <span class=\"math-inline\" data-math=\"6\\ \\pi\" data-index-in-node=\"92\">6\u03c0<\/span>\u00a0electrons. Four electrons come from the two carbon-carbon double bonds, and the remaining two come from one of the lone pairs on the oxygen atom residing in an unhybridized <span class=\"math-inline\" data-math=\"p\" data-index-in-node=\"272\">$p$<\/span>-orbital.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199673\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199673\" aria-controls=\"collapse199673\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Does furan satisfy H\u00fcckel's Rule?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199673\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199673\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Yes. It follows the H\u00fcckel rule of aromaticity where <span class=\"math-inline\" data-math=\"4n+2 = 6\" data-index-in-node=\"95\">4n+2 = 6<\/span> (for <span class=\"math-inline\" data-math=\"n=1\" data-index-in-node=\"109\">n=1<\/span>), making it a fully aromatic compound.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199674\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199674\" aria-controls=\"collapse199674\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the hybridization of the oxygen atom in furan?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199674\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199674\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>The oxygen atom in furan is <span class=\"math-inline\" data-math=\"sp^2\" data-index-in-node=\"91\">sp<sup>2<\/sup><\/span>\u00a0hybridized. This allows one lone pair to stay in a hybrid orbital in the ring plane while the other sits in a perpendicular <span class=\"math-inline\" data-math=\"p\" data-index-in-node=\"220\">$p$<\/span>-orbital to join the aromatic system.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199675\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199675\" aria-controls=\"collapse199675\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Where do the two lone pairs of the oxygen atom in furan reside?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199675\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199675\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>One lone pair is in an <span class=\"math-inline\" data-math=\"sp^2\" data-index-in-node=\"95\">sp<sup>2<\/sup><\/span>\u00a0hybrid orbital pointing outward within the plane of the molecule. The second lone pair is in an unhybridized <span class=\"math-inline\" data-math=\"p\" data-index-in-node=\"209\">\u03c0<\/span>-orbital, which participates directly in the cyclic <span class=\"math-inline\" data-math=\"\\pi\" data-index-in-node=\"262\">\u03c0<\/span>-cloud.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199676\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199676\" aria-controls=\"collapse199676\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Can you use a standard Grignard reagent on a molecule with a free hydroxyl group to synthesize furan?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199676\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199676\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>No. Grignard reagents are highly basic and will immediately pull an acidic proton from the hydroxyl group, killing the reagent and producing methane gas instead of driving a cyclization.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199677\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199677\" aria-controls=\"collapse199677\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the Paal-Knorr synthesis for furan?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199677\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199677\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>It is a classic method where a 1,4-dicarbonyl compound undergoes a dehydrative cyclization in the presence of an acid catalyst (like <span class=\"math-inline\" data-math=\"\\text{H}_2\\text{SO}_4\" data-index-in-node=\"185\">H<sub>2<\/sub>SO<sub>4<\/sub><\/span>) or a dehydrating agent (like <span class=\"math-inline\" data-math=\"\\text{P}_2\\text{O}_5\" data-index-in-node=\"237\">P<sub>2<\/sub>O<sub>5<\/sub><\/span>) to yield a substituted furan ring.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199678\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199678\" aria-controls=\"collapse199678\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the role of the acid catalyst in the Paal-Knorr furan synthesis?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199678\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199678\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>The acid protonates one of the carbonyl oxygens, enhancing its electrophilicity. This prompts the other carbonyl oxygen to attack nucleophilically from within the molecule, closing the ring.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-199679\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse199679\" aria-controls=\"collapse199679\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How does the Feist-Benary synthesis work?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse199679\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-199679\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>This reaction involves the condensation of an <span class=\"math-inline\" data-math=\"\\alpha\" data-index-in-node=\"98\">\u03b1<\/span>-halogenated carbonyl compound with a \u03b2-keto ester in the presence of a base (like ammonia or pyridine) to produce a substituted furan ring.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-1996710\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse1996710\" aria-controls=\"collapse1996710\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Can tetrahydrofuran (THF) be converted into furan?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse1996710\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-1996710\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Yes, passing THF over a heated metallic catalyst like palladium (<span class=\"math-inline\" data-math=\"\\text{Pd}\" data-index-in-node=\"126\">Pd<\/span>) or nickel (<span class=\"math-inline\" data-math=\"\\text{Ni}\" data-index-in-node=\"148\">Ni<\/span>) strips away hydrogen atoms via catalytic dehydrogenation, turning the saturated ring into aromatic furan.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-1996711\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse1996711\" aria-controls=\"collapse1996711\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Why is furan less aromatic than thiophene and pyrrole?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse1996711\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-1996711\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Oxygen is highly electronegative and holds its lone pair tightly, making it less willing to share its electrons into the aromatic cloud compared to nitrogen in pyrrole or the better orbital overlapping of sulfur in thiophene.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-1996712\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse1996712\" aria-controls=\"collapse1996712\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Does furan undergo the Diels-Alder reaction?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse1996712\" data-parent=\"#sp-ea-19967\" role=\"region\" aria-labelledby=\"ea-header-1996712\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Yes. Due to its lower aromatic resonance energy, furan acts like a conjugated diene and readily undergoes <span class=\"math-inline\" data-math=\"[4+2]\" data-index-in-node=\"161\">[4+2]<\/span>\u00a0cycloaddition reactions with strong dienophiles like maleic anhydride.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<\/div>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Synthesis and reactivity of Furan is a crucial topic for IIT JAM, CSIR NET, GATE, and CUET PG. Enhance your competitive exam preparation with VedPrep. This topic is essential for students preparing for CSIR NET, IIT JAM, CUET PG, and GATE.<\/p>\n","protected":false},"author":11,"featured_media":11955,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","rank_math_seo_score":86},"categories":[23],"tags":[2923,6594,6595,6597,6596,2922],"class_list":["post-11956","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-iit-jam","tag-competitive-exams","tag-synthesis-and-reactivity-of-furan-for-iit-jam","tag-synthesis-and-reactivity-of-furan-for-iit-jam-notes","tag-synthesis-and-reactivity-of-furan-for-iit-jam-pdf","tag-synthesis-and-reactivity-of-furan-for-iit-jam-questions","tag-vedprep","entry","has-media"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/posts\/11956","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/comments?post=11956"}],"version-history":[{"count":7,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/posts\/11956\/revisions"}],"predecessor-version":[{"id":19971,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/posts\/11956\/revisions\/19971"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/media\/11955"}],"wp:attachment":[{"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/media?parent=11956"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/categories?post=11956"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/tags?post=11956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}