| 摘要 |
A process for the preparation of 3-cyano-3,5,5-trimethylcyclohexanone by the reaction of isophorone with hydrogen cyanide in the presence of quaternary ammonium catalysts at temperatures ranging from 80 DEG to 180 DEG C. and pressures ranging from 0.5 to 20 bar, in which the ammonium catalysts used are salts of the general formula I <IMAGE> (I) in which R1, R2, R3, R4 denote C1-C18 alkyl, C5-C8 cycloalkyl, aryl, C7-C18 aralkyl or C2-C18 hydroxyalkyl and X denotes HCO3 or <IMAGE> with the proviso that R4 stands for C1-C8 alkyl when X is <IMAGE>
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