Method of preparing alkoxymethylene compounds

US4277418A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Otto Ackermann
• Dieter Bretzinger · Güstrow, DE
• Herbert Schneidewind · Troisdorf, DE
• Rudolf Stephan · Ludwigshafen, DE

Key dates

• Filing date: Feb 26, 1979
• Grant date: Jul 7, 1981
• Expiry date: Feb 26, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C255/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improvement in the alkoxylation of a compound having a reactive methylene group by contacting said compound with an orthoformic acid trialkyl ester in the presence of a catalyst, the improvement residing in employing at least 1.6 moles of orthoformic acid ester per mole of compound having a reactive methylene group and carrying out the process in the presence of a catalyst of the group of aliphatic carboxylic acids, anhydrides of aliphatic carboxylic acids, aromatic sulphonic acids, alkali metal alcoholates and alkanolamines.