Method for the preparation of 4-chloro-2-methyl-crotonaldehyde

Details Method for the preparation of 4-chloro-2-methyl-crotonaldehyde Method for the preparation of 4-chloro-2-methyl-crotonaldehyde

1976-05-11

1977-10-18

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4714

Patent

active

040546080

ABSTRACT:
In the preparation of 4-chloro-2-methyl-crotonaldehyde, an important starting material for the preparation of the acetate of Vitamin A, the improvement consisting in that isoprene monoepoxide (1:2-epoxy-2-methyl-3-butene) is chlorinated either with tert.butyl hypochlorite in the vapor phase, or with cupric chloride in the liquid phase. The reaction is preferably carried out in an inert siliceous or aluminous substrate at temperatures ranging from 60.degree. C to 150.degree. C. Lithium chloride has proven to be useful as a catalyst, but by no means essential.

REFERENCES:
patent: 3268430 (1966-08-01), Brois et al.

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