PROCESS FOR THE PREPARATION OF 1,1-DISUBSTITUTED ETHYLENE COMPOUNDS

摘要

1,1-Disubstituted ethylene compounds of the formula I …… in which… Z is COOR<2>, CN or COR<3>,… R<1> denotes an aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radical which may optionally be further substituted by functional groups which are inert under the reaction conditions,… R<2> denotes an aliphatic, cycloaliphatic or araliphatic radical having 1 to 15 carbon atoms and… R<3> denotes an aliphatic, cycloaliphatic or araliphatic radical having 1 to 15 carbon atoms which may be substituted by groups which are inert under the reaction conditions, it being however also possible for R<1> together with R<2> or R<1> together with R<3> to form an alkylene chain having 2 to 10 carbon atoms, which may be substituted by groups which are inert under the reaction conditions, are prepared from formyl compounds of the formula II …… in which Z, R<1>, R<2> and R<3> have the abovementioned meanings, the reaction being carried out in the presence of formaldehyde or paraformaldehyde and… a) a C1-C12-alkanol or… b) a mixture of a C1-C12-alkanol and water or… c) using water in the presence of a secondary amine and a protic acid at temperatures of 0 to 200 DEG C.