Process for preparing methyl heptenone

Details Process for preparing methyl heptenone Process for preparing methyl heptenone

Filed on

1975-03-24

Date issued

1976-08-24

Examiner

Thomas, Jr., James O.

Patent Class

Chemistry of carbon compounds

SubClass

Miscellaneous organic carbon compounds

SubSubClass

C-metal

Other Related Categories

C07C 4500

Type

Patent

Status

active

Patent number

039767000

Description

ABSTRACT:
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.

REFERENCES:
patent: 3002999 (1961-10-01), Lichtenberger et al.
patent: 3668255 (1972-06-01), Meuly et al.

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