Hemiacetals of glyoxylic esters and a process for the isolation

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

1988-05-11

1989-03-21

Gray, Bruce D.

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

Organic compounds

Carboxylic acid esters

C07C 6966

Patent

active

048144916

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.

REFERENCES:
patent: 4156093 (1979-05-01), Christidis
patent: 4443623 (1984-04-01), Photis
patent: 4692547 (1987-09-01), Driscoll et al.
Oroshnik, W. et al., J. Amer. Chem. Soc. 63, 3338-3339 (1941).

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