| abstract |
A process is proposed for producing acyloines of general formula (I) in which R<a> and R<b> are identical or different and represent hydrogen or a C1-C20 alkyl, a C6-C10 aryl, a C7-C12 aralkyl, a heteroaryl, or a heterocycloalkyl group, these groups being substituted if appropriate, with the exception of formaldehyde autocondensation products. In the proposed process, an aldehyde of formula (II) R<a>CHO is allowed to react with an aldehyde of formula (III) R<b>CHO, in which R<a> and R<b> have the meanings indicated above and at least one of the groups R<a> and R<b> represents a group other than hydrogen, in the presence of catalysts produced using an auxiliary base from triazolium salts of formula (IV) in which R<1> and R<3> are identical or different and represent aliphatic groups with 1-30 carbon atoms, or, if appropriate, aryl groups, aralkyl groups and/or heteroaryl groups, these groups being substituted if appropriate; R<2> represents hydrogen or the group R<b>CH(OH); and A is the equivalent of a singly or multiply negatively charged anion for the electrical neutralisation of the triazolium cation charge. |