Preparation of 1,1-disubstituted ethylene compounds

US4997955A · kind A · utility

Assignee

• BASF SE

Inventors

• Franz Merger · Bischofswerda, DE
• Joerg Liebe · Bischofswerda, DE
• Werner Bertleff · Viernheim, DE

Key dates

• Filing date: Jun 10, 1988
• Grant date: Mar 5, 1991
• Expiry date: Jun 10, 2008

Classification

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

Abstract

1,1-disubstituted ethylene compounds of the general formula I ##STR1## where Z is COOR.sup.2, CN or COR.sup.3, R.sup.1 is an aliphatic, cycloalophatic, araliphatic, aromatic or heterocyclic radical which may be further substituted by functional groups which are inert under the reaction conditions, R.sup.2 is an aliphatic, cycloaliphatic or araliphatic radical of 1 to 15 carbon atoms and R.sup.3 is an aliphatic, cycloaliphatic or araliphatic radical of 1 to 15 carbon atoms which may be substituted by groups which are inert under the reaction conditions, and R.sup.1 together with R.sup.2 or R.sup.1 together with R.sup.3 may furthermore form an alkylene chain of 2 to 10 carbon atoms which may be substituted by groups which are inert under the reaction conditions, are prepared from a formyl compound of the general formula II ##STR2## where Z, R.sup.1, R.sup.2 and R.sup.3 have the above meanings, by a process in which the reaction is carried out in the presence of formaldehyde or paraformaldehyde and PA1 (a) a C.sub.1 -C.sub.12 -alkanol or PA1 (b) a mixture of a C.sub.1 -C.sub.12 -alkanol and water or PA1 (c) with water in the presence of a secondary amine and a protic acid at from 0.de…