Isomer conversions in perfluoro-1-ethylindane under the action of antimony pentafluoride

Perfluoro-1-ethylindane on heating with SbF₅ is isomerized to perfluoro-1,1-dimethylindane, perfluoro-,-o-trimethylstyrene, and perfluoro-1,2-dimethylindane. In the presence of SbF₅, the latter two products are converted one into the other. In addition, in SbF₅ perfluoro-1,2-dimethylindane is defluorinated to perfluoro-2,3-dimethylindene and fluorinated to perfluoro-2,3-dimethyl-4,5,6,7-tetrahydroindene which is further fluorinated to perfluoro-1,2-dimethyl-4,5,6,7-tetrahydroindane and is converted at 200C to perfluoro-1,7-dimethylindane. The latter is also formed on heating perfluoro-,-o-trimethylstyrene with SbF₅ at 200C.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 645–652, March, 1990.