Preparation of 4,4-disubstituted cyclohexadienones
申请人:Shell Oil Company
公开号:US04663487A1
公开(公告)日:1987-05-05
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.
Anodic oxidation of p-disubstituted benzenes in the presence of fluoride ion
作者:I.N. Rozhkov、I.Y. Alyev
DOI:10.1016/0040-4020(75)80112-8
日期:——
Electrochemical oxidation of aromatic compounds in the presence of fluoride ion gives products derived from initial oxidation of aromatic substrate and subsequent reaction with fluoride ion. The second of the one-electron transfer steps leads to benzenium ions, which give either fluoroaromatic compounds (elimination) or fluorocyclohexadienes (addition). The elimination of a t-butyl-group during anodic oxidation
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0188848A1
公开(公告)日:1986-07-30
@ The invention provides a process for the preparation of 4-fluorophenols of formula
wherein n is 0 to 3, each R independently represents a halogen atom or an alkyl, alkoxy, cyano or optionally substituted amino group and Z represents a hydrogen or halogen atom or a cyano group characterised by reacting a fluorohalocyclohexadienone of formula
wherein X represents a halogen atom, with a compound of formula A-Z, wherein Z is as defined above and A represents a hydrogen or alkali metal atom, provided that when both A and Z are hydrogen, the reaction is carried out in the additional presence of a Group VIII metal hydrogenation catalyst, and 4-fluorophenols of formula I per se wherein Z is a CN group.
本发明提供了一种制备式 4-氟苯酚的工艺 其中 n 为 0 至 3,每个 R 独立地代表卤素原子或烷基、烷氧基、氰基或任选取代的氨基,Z 代表氢或卤素原子或氰基,其特征在于将式(其中 X 代表卤素原子)的氟环己二烯酮与式 A-Z 的化合物反应,其中 Z 如上文所定义,A 代表氢或碱金属原子,条件是当 A 和 Z 均为氢时,该反应在另外存在第八族金属氢化催化剂的情况下进行,以及式 I 本身的 4-氟苯酚,其中 Z 为 CN 基团。
Meurs, Jan H. H.; Sopher, David W.; Eilenberg, Wolf, Angewandte Chemie, 1989, vol. 101, # 7, p. 955 - 956
作者:Meurs, Jan H. H.、Sopher, David W.、Eilenberg, Wolf
DOI:——
日期:——
Oxidative fluorination in amine-hf mixturess
作者:Jan H.H. Meurs、Wolf Eilenberg
DOI:10.1016/s0040-4020(01)87060-5
日期:1991.1
The selective electrochemical fluorination of alkenes, phenanthroline, naphthalene and chlorobenzene in neat amine-HF mixtures is described, together with the chemistry of 4,4-difluorocyclohexadienone.