摘要 |
The present invention relates to the preparation of alpha-hydroxy ketones of the general formula I. In particular, the invention relates to novel imidazolinium carboxylate adducts and to a novel process for using catalytic amounts of imidazolium and imidazolinium carboxylate adducts in the acyloin reaction of aldehydes to prepare hydroxy ketones of the general formula I, where R and R' are the same or different and are each H or a straight-chain or branched and optionally substituted C<SUB>1</SUB>-C<SUB>12</SUB>-alkyl radical, and R''-H<SUB>3</SUB>CSCH<SUB>2</SUB>CH<SUB>2</SUB>, t-butyl, n-butyl, sec-butyl, n-propyl, i-propyl, an optionally heteroatom-substituted C<SUB>6</SUB>-C<SUB>18</SUB>-aryl, heteroaryl, C<SUB>6</SUB>-C<SUB>18</SUB>-arylalkyl, especially phenylmethyl, where phenyl may again be heteroatom-substituted, or heteroalkyl.
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