Patent ID: 6207864
Filing Date: 2001-03-27
Classification: C07C,C07F

Abstract:
A process for the halogenation of cyclopropylmethyl ketone with at least one dihalo-triorganophosphorane of the general formula IR.sub.3 PHal.sub.2 (I),in which the radicals R can be the same or different and denote a saturated or unsaturated aliphatic C.sub.1 -C.sub.20 hydrocarbon radical, a phenyl or (C.sub.1 -C.sub.4 alkyl)phenyl radical, which may be optionally substituted by one or two fluorine, chlorine and/or nitro groups, P stands for phosphorus and Hal denotes chlorine, bromine, or iodine, at a temperature of from 80.degree. to 130.degree. C., where the dihalo-triorganophosphorane of the general formula (I) is synthesized in situ from triorganophosphane oxide or triorganophosphane sulfide of the general formula IIR.sub.3 (II),in which R is as defined above with respect to formula I and A stands for oxygen or sulfur, using a halogenating agent, wherein the triorganophosphane oxide or triorganophosphane sulfide is used in catalytic amounts.