Skeletal reactions of perfluoromethylethyl- and perfluorodiethylbenzocyclobutenes with 1,1- and 1,2-alkyl groups in SbF5
作者:V. M. Karpov、T. V. Mezhenkora、V. E. Platonov、G. G. Yakobson�
DOI:10.1007/bf00961700
日期:1990.5
Taking perfluoro-1,1-dialkylbenzocyclobutenes as examples, it has been shown to be possible to enlarge the four-membered ring in polyfluorobenzocyclobutenes to five-membered in the presence of SbF5, by cleavage of the four-membered ring followed by cyclization of the resulting polyfluorostyrene to the polyfluoroindane, which then undergoes further reactions. Perfluoro-1-methyl-1-ethylbenzocyclobutene isomerizes at 50-degrees-C in the presence of SbF5 to perfluoro-alpha,beta-omicron-trimethylstyrene, which is reversibly converted at 130-degrees-C into perfluoro-1,2-dimethylindane. Perfluoro-1,1-diethylbenzocyclobutene isomerizes at 130-degrees-C in the presence of SbF5 to give perfluoro-alpha-ethyl-beta,o-dimethylstyrene, which at 170-degrees-C gives perfluoro-2-methyl-3-ethylindene- and perfluoro-2-methyl-3-ethyl-4,5,6,7-tetrahydroindene. The last two compounds, together with perfluoro-o-dipropylbenzene, are obtained from perfluoro-1,2-diethylbenzocyclobutene with SbF5 at 170-degrees-C. From perfluoro-1-methyl-2-ethyl-benzocyclobutene with SbF5 at 95-degrees-C there is obtained perfluoro-1-ethylindane, while at 130-degrees-C, in addition to the latter compound, there are obtained perfluorinated 1,1-dimethylindane, 1,2-dimethylindane, alpha,beta,o-trimethylstyrene, 2,3-dimethylindene, and 2,3-dimethyl-4,5,6,7-tetrahydroindene.