Description
May be prepared by the action of alkalis or bases on the ester of
α-bromoisovaleric acid; by condensation of acetone with malonic
acid or bromoacetic ester; by oxidation of mesityl oxide with
sodium hypochlorite.
Chemical Properties
3-Methylcrotonic acid has green, phenolic, dairy aroma
Chemical Properties
White to brown crystal
Occurrence
Reported found in the rhizomes of Senecio kaempferi Seib.; the corresponding ester occurs naturally in waste
wort. Also reported found in raspberries, wheat bread, cocoa, coffee, black tea, Arctic bramble, and green and roasted maté.
Uses
Chemical Intermediates.
Definition
ChEBI: A methyl-branched fatty acid that is but-2-enoic acid bearing a methyl substituent at position 3.
Preparation
By the action of alkalis or bases on the ester of α-bromoisovaleric acid; by condensation of acetone with malonic acid or
bromoacetic ester; by oxidation of mesityl oxide with sodium hypochlorite.
Purification Methods
Crystallise the acid from hot water or pet ether (b 60-80o). [Beilstein 2 IV 1555.]
