Patent · US Expired

Hemiacetals of glyoxylic esters and a process for the isolation of glyoxylic esters

US4814491A · kind A · utility

3Cited by

3References

7Claims

0Family size

Assignee

Hoescht Aktiengesellschaft · DE

Inventors

Robert K. Driscoll · Frankfurt am Main, DE
Ernst I. Leupold · Neu-Anspach, DE
Joachim Schutz · Hofheim, DE

Key dates

Filing date	May 11, 1988
Grant date	Mar 21, 1989
Priority date	—
Expiry date	May 11, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C67/54
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to hemiacetals of glyoxylic esters and to a process for obtaining a glyoxylic ester having a C.sub.1 to C.sub.4 ester group from a mixture which essentially contains a glyoxylic ester of this type plus water and/or a C.sub.1 to C.sub.4 alcohol ROH. In this, the glyoxylic ester and the water and/or the alcohol are partly or completely in a chemically bonded form. A higher alcohol R'OH having a boiling point above 180.degree. C. is added, and distillation is carried out under a pressure not exceeding 800 mbar to remove first the water and/or the alcohol ROH and then the glyoxylic ester.

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