Reaction with formic acid of triarylmethanols containing para-fluorine substituents gives, in addition to the expected triarylmethanes, products in which one fluorine has been replaced by a hydroxy-group; in contrast, pentafluorophenyldiphenylmethanol on similar treatment gives the pentafluorophenyldiphenylmethane together 9-(pentafluorophenyl)-fluorene.
A. F. Andrews, B. M. J. Vandenbulcke and J. C. Walton, J. Chem. Soc., Chem. Commun., 1978, 389 DOI: 10.1039/C39780000389
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