2021年7月31日 · Unsaturated carboxylic acids of the type \(\ce{RCH=CH(CH_2)}_n \ce{COOH}\) usually exhibit the properties characteristic of isolated double bonds and isolated carboxyl groups when \(n\) is large and the functional groups are far apart.

An α,β-unsaturated acid is a type of α,β-unsaturated carbonyl compound that consists of an alkene conjugated to a carboxylic acid. [3] The simplest example is acrylic acid (CH 2 =CHCO 2 H). These compounds are prone to polymerization, giving rise to …

In organic chemistry, a carboxylic acid is an organic acid that contains a carboxyl group (−C(=O)−OH) [1] attached to an R-group. The general formula of a carboxylic acid is often written as R−COOH or R−CO 2 H, sometimes as R−C(O)OH with R referring to an organyl group (e.g., alkyl, alkenyl, aryl), or hydrogen, or other groups ...

2020年8月23日 · The decarboxylation mechanism of $\beta,\gamma$-unsaturated carboxylic acid compounds undergo the reaction through a cyclic transition complex to give alkene products. This mechanism mimics the one proposed for the thermal decomposition of $\beta$-keto acids.

The carbocation Lewis acid tritylium tetrafluoroborate (TrBF 4) catalyzes a 1,2-hydride migration of α-alkyldiazoacetates to provide (Z)-α,β-unsaturated esters in good yields and with high regioselectivities. Using the same catalytic system, in situ-generated cross-coupling adducts of aldehydes and α-alkyldiazoacetates give α-branched β ...

Conjugation of a double bond to a carbonyl group transmits the electrophilic character of the carbonyl carbon to the beta-carbon of the double bond. These conjugated carbonyl are called enones or α, β unsaturated carbonyls. A resonance description of this transmission is …

2014年2月19日 · A carefully designed three-step unsaturation of carboxylic acids is described. Briefly, carboxylic acids were converted to the trifluoromethyl ketone. Subsequent treatment with selenium dioxide followed by hydrolysis afforded α,β-unsaturated carboxylic acids.

2024年12月3日 · Ricinoleic acid, an unsaturated hydroxy acid (i.e., one containing an ―OH group), occurs in castor oil. When this acid is pyrolyzed (heated in the absence of air), it breaks down to give undecylenic acid and n -heptaldehyde.

2023年1月25日 · Unsaturated carboxylic acids are the carboxyl compounds in which the \(-\text {COOH}\) group is attached to the side group that comprises double or triple bonded carbon atoms, i.e., \(\text {R}\) represents an alkyl group made up of double and triple bonds.

1995年12月4日 · Unsaturated carboxylic acids are converted to percarboxylic acids catalyzed by an immobilized lipase from Candida antarctica (Novozym 435 R). These unsaturated percarboxylic acids are only intermediates and epoxidize themselves in good yields and almost without consecutive reactions.