Process for the preparation of glyoxylic hemiacetal esters

Details Process for the preparation of glyoxylic hemiacetal esters Process for the preparation of glyoxylic hemiacetal esters

1985-12-18

1987-09-08

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560179, 562587, C07C 6731

Patent

active

046925473

ABSTRACT:
The invention relates to a process for the preparation of glyoxylic hemiacetal esters, in which first glycolic esters are oxydehydrogenated to give glyoxylic esters, and then the latter are reacted with an alcohol. The gaseous reaction mixture formed in the oxydehydrogenation is introduced, together with an excess of an alcohol which is suitable as an entraining agent, into a distillation column and then the water of reaction is distilled overhead together with other low-boilers and part of the excess alcohol, the glyoxylic hemiacetal ester and the remainder of the excess alcohol resulting as the bottom product.
In a variant of the process, use is made of an additional inert entraining agent whose azeotrope with water boils below 90.degree. C. and below the alcohol which is used, and then the water of reaction is distilled overhead with the assistance of this entraining agent.

REFERENCES:
patent: 4156093 (1979-05-01), Christidis

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