Patent · US Expired

Process for the preparation of glyoxylic hemiacetal esters

US4692547A · kind A · utility

6Cited by

1References

8Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Robert K. Driscoll · Frankfurt am Main, DE
Ernst I. Leupold · Neu-Anspach, DE
Wolfgang Ebertz · Hattersheim, DE

Key dates

Filing date	Dec 18, 1985
Grant date	Sep 8, 1987
Priority date	—
Expiry date	Dec 18, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C69/708
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.