Catalytic preparation of condensation products of formaldehyde

摘要

A process for the catalytical preparation of condensation products of formaldehyde, in which formaldehyde or a formaldehyde-forming compound is caused to undergo reaction using a catalyst which has been produced, in the presence of an auxiliary base, from a triazolium salt of formula I <IMAGE> (I) in which R1 and R3 are the same or different and stand for aliphatic groups having from 1 to 30 carbon atoms, optionally substituted aryl groups, optionally substituted aralkyl groups, and/or optionally substituted heteroaryl groups, R2 represents hydrogen, the hydroxymethylene group -CH2OH or the hydroxy-hydroxymethylene-methylidyne group -CH(OH)(CH2OH), and R4 denotes hydrogen, a halogen atom, a nitro or cyano group, an aliphatic group having from 1 to 30 carbon atoms, an optionally substituted aryl group, an optionally substituted aralkyl group, an optionally substituted heteroaryl group, an alkoxy group -OR5, a thioether group -SR6, an amino group -NR7RR8, an acyl group -COR9 or an ester group -COOR10, where R5, R6, R7, R8, and R9 stand for radicals such as those stated above for R1, and R10 is a C1-C30alkyl group or an optionally substituted aryl or aralkyl group, or R3 and R4 together form a C3-C5alkylene or C3-C5 alkenylene group or a C6-C14arylene group, or a C7-C14aralkylene or C8-C14 aralkenylene bridging member, and A is the equivalent of an anion having one or more negative charges for electrical neutralization of the charge on the triazolium cation.