VERFAHREN ZUR HERSTELUNG VON 1,1-DISUBSTITUIERTEN ETHYLENVERBINDUNGEN.

摘要

Prodn. of 1,1-di-substd. ethylene cpds., which are 2-substd. acrylate ester, acrylonitrile or alpha-methylene ketones of formula R1ZC=CH2 (I), involves the use of the corresp. formyl cpds. (R1)ZCH-CHO (II) as starting materials: Z = COOR2, CN or COR3; R1 = an aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic gp., opt. with functional substits. which are inert under the reaction conditions; R2 = a 1-15 C (cyclo)aliphatic or araliphatic gp.; R3 = a 1-15 C (cyclo)aliphatic or araliphatic gp., opt. with functional substits. which are inert under the reaction conditions. The novelty is that reaction is carried out at 0-200 deg. C. in the presence of HCHO or paraformaldehyde and (a) a 1-12 C alkanol, (b) a mixt. of a 1-12 C alkanol and water or (c) water in the presence of a sec. amine and a protonic acid.