Preparaion of 3.cyano-3,5,5-trimethylcyclohexanone
AssigneeBASF SE
InventorsKlaus Mundinger, Gerhard Laqua, Tom Witzel, Franz Merger
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Abstract
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.degree. to 180.degree. C. and pressures ranging from 0.5 to 20 bar, in which the ammonium catalysts used are salts of the general formula I ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4 denote C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.8 cycloalkyl, aryl, C.sub.7 -C.sub.18 aralkyl or C.sub.2 -C.sub.18 hydroxyalkyl and X denotes HCO.sub.3 or ##STR2## with the proviso that R.sup.4 stands for C.sub.1 -C.sub.8 alkyl when X is ##STR3##
Claims6
A process for the preparation of 3-cyano-3,5,5-trimethylcyclohexanone by the reaction of isophorone with hydrogen cyanide in the presence of a quaternary ammonium catalyst at temperatures ranging from 80.degree. to 180.degree. C. and pressures ranging from 0.5 to 20 bar, wherein the ammonium catalyst used is a salt of the general formula I ##STR9## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4 denote C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.8 cycloalkyl, aryl, C.sub.7 -C.sub.18 aralkyl or C.sub.2 -C.sub.18 hydroxyalkyl and
- X denotes HCO.sub.3 or ##STR10## with the proviso that R.sup.4 stands for C.sub.1 -C.sub.8 alkyl when X is ##STR11##
Dependencies are inferred from the claim text.