Selective Halofluorination of Alkenes with Tetrabutylphosphonium Dihydrogentrifluoride in Combination with<i>N</i>-Halosuccinimide or 1,3-Dibromo-5,5-dimethylhydantoin
Alkenes and their functionalized derivatives were readily converted to the corresponding halofluorides with tetrabutylphosphonium dihydrogentrifluoride as combined with N-halosuccinimides or 1,3-dibromo-5,5-dimethylhydantoin in highly regio-, stereo-, and chemoselective manners. In particular, alkenes having a oxirane or primary hydroxyl group also underwent halofluorination selectively in good yields
The massspectra of the dichloro- and bromochloro-cyclobutanes, the dichlorocyclopentanes, and the dichloro-, chlorofluoro-, and stable dibromo-cyclohexanes are reported. Four major breakdown pathways can be distinguished, the favoured fragmentation route depending on the ring size, the type of halogen substitution, the the relative position, and cis–trans-relationships of the two substituents. Within
Reaction of alkylhypochlorites and xenon difluoride with cyclohexene
作者:Dale F. Shellhamer、Mark J. Horney、Andrew L. Toth、Victor L. Heasley
DOI:10.1016/s0040-4039(00)60891-2
日期:1992.11
Reactions of alkylhypochlorites and xenondifluoride with cyclohexene give primarily 1-chloro-2-fluorocyclohexanes via formation of a complex between xenondifluoride and the alkylhypochlorite.