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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.8K
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

10.9K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.6K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
5.3K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

5.6K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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Butenolide Synthesis from Functionalized Cyclopropenones.

Sean S Nguyen, Andrew J Ferreira, Zane G Long

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    Researchers developed a new synthesis for substituted butenolides using hydroxymethylcyclopropenones. This method efficiently creates diverse butenolide scaffolds through a phosphine-catalyzed ring-opening and cyclization process.

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    Area of Science:

    • Organic Chemistry
    • Synthetic Chemistry

    Background:

    • Butenolides are important heterocyclic compounds with diverse biological activities.
    • Existing synthetic methods for substituted butenolides can be limited in scope or require harsh conditions.

    Purpose of the Study:

    • To develop a general and efficient method for synthesizing substituted butenolides.
    • To explore the utility of hydroxymethylcyclopropenones as precursors for butenolide synthesis.

    Main Methods:

    • Utilizing functionalized hydroxymethylcyclopropenones.
    • Employing catalytic amounts of phosphine to induce ring-opening and form ketene ylides.
    • Trapping ketene ylide intermediates with pendant hydroxy groups for cyclization.

    Main Results:

    • Efficient synthesis of α- and γ-substituted butenolides.
    • The reaction is tolerant of a broad range of functional groups.
    • The method works in diverse solvents with low catalyst loadings.

    Conclusions:

    • A novel and versatile synthetic route to substituted butenolides has been established.
    • Hydroxymethylcyclopropenones are effective precursors for constructing butenolide scaffolds.
    • The developed method offers a practical approach for accessing diverse butenolide structures.