Process for preparing methyl heptenone by reaction of prenyl-substituted
申请人:Rhodia, Inc.
公开号:US04153633A1
公开(公告)日:1979-05-08
A process is provided for preparing methyl heptenone by reacting a ketone mixture comprising prenyl-substituted methyl pentenones with a polyfunctional amine, optionally in the presence of an inorganic alkali. The yield of methyl heptenone can be increased by hydrolysis of the reaction product with water.
Process for preparing methyl heptenone from prenyl mesityl oxide using
申请人:Rhodia, Inc.
公开号:US04153634A1
公开(公告)日:1979-05-08
A process is provided for preparing methyl heptenone from a ketone mixture comprising isomers of prenyl mesityl oxide; the mixture is subjected to hydrolytic cracking with water in the presence of an amine catalyst, and, optionally, an inorganic alkali, at an elevated temperature, and methyl heptenone is recovered.
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 temperature, 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.