The invention provides a process for the preparation of 4,4-disubstituted cyclohexadienones of which at least one of the substituents is fluorine, which comprises reacting a compound of formula ##STR1## wheren 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.
该发明提供了一种制备4,4-二取代环己二酮的方法,其中至少一个取代基是
氟,包括将式化合物与
氢氟酸和Pb(IV)化合物在化合物存在下反应,其中X代表氢原子或卤素原子或烷基,每个R独立代表卤素原子或烷基、烷氧基、
氰基或可选的取代
氨基团,Z代表氢原子或烷基、酰基或芳氧羰基团,n为0至4,并且在存在一化合物作为对
氢氟酸的碱的情况下进行。