Process for preparing glyoxylic esters and their hydrates

US5939580A · kind A · utility

Assignee

• DSM Fine Chemicals Austria GmbH · AU

Inventors

• Engelbert Kloimstein · Eferding, AT
• Wolfram Hendel · Leonding, AT
• Klaus Reiter · Linz, AT
• Christian Burger · Leonding, AT
• Antonia Praus · Linz, AT
• Karl-Heinz Giselbrecht · Linz, AT
• Eduard Perndorfer · Traun, AT

Key dates

• Filing date: Nov 21, 1997
• Grant date: Aug 17, 1999
• Expiry date: Nov 21, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/333
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing glyoxylic esters or their hydrates in which a water-soluble salt of a maleic or fumaric monoester or a mixture thereof is reacted with ozone in aqueous solution at temperatures of from 0 to 50.degree. C., and the corresponding glyoxylic ester or its hydrate is isolated from the resulting reaction mixture.