| abstract |
A process for the production of acyloin of formula (I), except for the formaldehyde auto-condensation product, is disclosed.n n n n n n n n Wherein R a and R b are the same or different and represent hydrogen or a C 1 -C 20 alkyl, a C 6 -C 10 aryl, a C 7 -C 12 aralkyl, a heteroaryl, or a heterocycloalkyl group, If appropriate, substituted.n n n In the process of the present invention, the aldehyde of the formula (II) R a CHO is reacted with an aldehyde of the formula (III) R b CHO in the presence of a catalyst which is produced from a triazolium salt of the formula (IV) using an auxiliary base. Wherein R a and R b have the meanings indicated above and at least one of the radicals R a and R b represents a group other than hydrogen.n n n n n n n n As of R 1 and R 3 are the same or different type, an aliphatic group of a number of C atoms from 1 to 30, or, where appropriate, an aryl group, an aralkyl Keeley and (or) represents a heteroaryl group, these groups being substituted, where appropriate, R 2 Represents a hydrogen or group R < b & gt ; CH (OH), and A is a single or multiple negatively charged anion equivalents for the electrical neutralization of the charge on the triazolium cation. |