Process for preparing methyl heptenone

Details Process for preparing methyl heptenone Process for preparing methyl heptenone

C - Chemistry, Metallurgy

07

C

260/584.7

C07C 49/20 (2006.01) C07C 45/28 (2006.01)

Patent

CA 1057775

PROCESS FOR PREPARING METHYL HEPTENONE ABSTRACT OF THE DISCLOSURE A process is provided for preparing methyl heptenone from mesityl oxide or acetone or mixtures thereof in improved yield. Mesityl oxide is reacted with prenyl chloride to form a ketone mixture comprising mixed prenyl-substituted methyl pentenones, which is then separated from the residual reaction mixture by distillation, subjected to hydrolytic cracking with water in the presence of alkali at an elevated tempera- ture, and methyl heptenone recovered. The same ketone mixture is found as a by-product of the reaction of acetone with prenyl chloride in the presence of a catalyst to form methyl heptenone. This can therefore be subjected to the hydrolytic cracking reaction, thus increasing the amount of methyl heptenone produced.

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