The invention provides a process for the preparation of 4,4-disubstituted cyclohexadienones of which at least one of the substituents is fluorine, characterised by reacting a compound of formula
wherein X represents a hydrogen or halogen atom or an alkyl group, each R independently represents a halogen atom or an alkyl, alkoxy, or cyano or optionally substituted amino group, Z represents a hydrogen atom or an alkyl, acyl or aryloxycarbonyl group, and n is 0 to 4, with hydrogen fluoride and a Pb(iV) compound, in the presence of a compound which acts as a base towards HF.
本发明提供了一种制备 4,4-二取代环
己二烯酮(其中至少一个取代基为
氟)的工艺,其特征在于将式中 X 代表氢原子或卤素原子或烷基,每个 R 独立地代表卤素原子或烷基、烷氧基或
氰基或任选取代的
氨基,Z 代表氢原子或烷基、酰基或芳氧羰基,n 为 0 至 4 的化合物,在对 HF 起碱作用的化合物存在下,与
氟化氢和 Pb(iV) 化合物反应。