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When perfluoro-1-alkylbenzocyclobutenes and -indanes were dissolved in an excess of SbF5, perfluorinated alkylbenzocycloalken-1-yl cations containing a fluorine atom or a perfluoroalkyl group in the cationic centre were generated. Contrary to expectations, a number of stable long‐lived perfluoro-1-isopropylbenzocycloalken-1-yl cations containing an electron-withdrawing perfluoroisopropyl group in...
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