| 摘要 |
The invention relates to a method for the production of an ester of an unsaturated carboxylic acid by reaction of an ester formed from the unsaturated carboxylic acid and a C1-C4 alkanol with an alcohol R<3>OH in the presence of a transesterification catalyst, where R<3> = a C4-C20 alkyl group, a C5-C7-cycloalkyl group, a phenyl-C1-C4 alkyl group, or a C2-C12 alkyl group, substituted by at least one NR<5>R<5> group, or 1 to 3 hydroxy groups or C1-C4 alkoxy groups, or interrupted by one or more oxygen heteroatoms, whereby the group R<5> = independently of each other, C1-C6 alkyl, or, together with the nitrogen atom, form a 5-7 membered heterocyclic ring which can optionally contain a further nitrogen or oxygen atom. At least one metal alkanoate is used as transesterification catalyst with at least one OR<1> group, where R<1> = a 4-(2,2,6,6-tetraalkylpiperidine-N-oxide). The invention further relates to a metal alcoholate with at least one OR<1> group, where R<1> = a 4-(2,2,6,6-tetraalkylpiperidine-N-oxide) and the use thereof as a transesterification catalyst.
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