7,7-Dichloro-2,5-diphenylbenzocyclopropene (1) undergoes exchange with silver fluoride under mild conditions to yield 7,7-difluoro-2,5-diphenylbenzocyclopropene (2); a substituted benzocyclopropenium ion (3) is proposed as an intermediate of the reaction.
P. Müller, J. Chem. Soc., Chem. Commun., 1973, 895 DOI: 10.1039/C39730000895
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