Process for the preparation of carboxylic acid esters of .beta.-

Details Process for the preparation of carboxylic acid esters of .beta.- Process for the preparation of carboxylic acid esters of .beta.-

1979-08-31

1981-11-17

Garner, Vivian

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

560 1, 560 8, 560 55, 560 64, 560105, 560112, 560113, 560125, 560126, 560187, 560226, 560230, 560238, 560240, 560262, 560265, 562607, 568876, 568877, 568878, C07C 67293, C07C 67297, C07C 69007, C07C 69145

Patent

active

043010849

ABSTRACT:
In a process for the preparation of a carboxylic acid ester of .beta.-formyl-crotyl alcohol by rearrangement of the corresponding carboxylic acid ester of 2-formyl-2-hydroxy-but-3-ene or of an acetal or acylate thereof in the presence of copper or a copper compound, followed, where relevant, by hydrolytic cleavage of the acetal or acylate, more especially in the preparation of 4,4-dimethoxy-3-methyl-crotyl acetate, the yield is improved by carrying out the rearrangement in the presence of copper (I) chloride as the catalyst and ensuring that low-boiling by-products formed during the rearrangement are removed.
The products are of great importance as starting materials for an industrial synthesis of vitamin A and its derivatives.

REFERENCES:
patent: 3639437 (1972-02-01), Fischer et al.

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