Preparation of 2-cyano-3,3-diarylacrylic esters

US5917080A · kind A · utility

Assignee

• BASF SE

Inventors

• Martin Holderbaum · Ludwigshafen, DE
• Karl Beck · Langen, DE
• Alexander Aumuller · Neustadt, DE
• Tom Witzel · Ludwigshafen, DE
• Guido Voit · Freinsheim, DE

Key dates

• Filing date: Dec 1, 1997
• Grant date: Jun 29, 1999
• Expiry date: Dec 1, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C253/30
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing 2-cyano-3,3-diarylacrylic esters of the general formula I ##STR1## where R.sup.1 and R.sup.2 are hydrogen, C.sub.1 -C.sub.12 -alkyl groups, C.sub.- C.sub.12 -alkoxy groups or di(C.sub.1 -C.sub.4 -alkyl)amino groups and R.sup.3 is a C.sub.4 -C.sub.18 -alkyl group which can be interrupted by ether-functional oxygen atoms, by reacting a benzophenone imine of the general formula II ##STR2## with a cyanoacetic ester of the general formula III ##STR3## wherein the reaction is carried out at from 20 to 60.degree. C. and, during this, the liberated ammonia is continuously removed from the reaction mixture with the aid of a stream of gas or by reducing the pressure to from 900 to 100 mbar.