Regiospecific preparation of α,α-dihalofluoromethyl perfluoroalkyl ketones via halogenation of perfluoro betaines
摘要:
Acylation of fluorinated phosphoranium salts with perfluorinated acyl chlorides provided the corresponding (Z)-perfluoro betaines in high yield. Subsequent chlorination or bromination of the betaines regiospecifically yields the alpha,alpha-dihalofluoromethyl perfluoroalkyl ketones. Halogen specificity is best controlled via use of CFCl3/Cl2 for the preparation of dichloroketones and CFBr3/Br2 for the corresponding dibromoketones. The dihalophosphorane by-product can promote a halogen-exchange reaction with ketones.
Regiospecific preparation of α,α-dihalofluoromethyl perfluoroalkyl ketones
作者:In Howa Jeong、Donald J. Burton、Daryl G. Cox
DOI:10.1016/s0040-4039(00)83859-9
日期:1986.1
Acylation of -phosphoranium salts with -acyl chlorides gives the corresponding -perfluoro betaine in high yield. Subsequent chlorination or bromination regiospecifically yields the α,α-dihalofluoromethyl perfluoroalkyl ketones.
Preparation of α-halo-F-2-ketones and F-2-ketones via fluorination of α,α-dihalo-F-2-ketones
作者:Donald J. Burton、Howa Jeong In
DOI:10.1016/s0022-1139(00)80488-1
日期:1993.11
Fluorination of α,α-dichloro-F-2-ketones with antimonypentafluoride provided excellent yields of α-chloro-F-2- ketones and F-2-ketones regioselectively. However, fluorination of α,α-dibromo-F-2-ketones with antimonypentafluoride gave a mixture of α-bromo-F-2-ketones and F-2-ketones.