Some reactions of triphenylmethyl compounds with boron fluoride

Triphenylmethyl derivatives, Ph 3 CX, where X = F, Cl, OH, or OCH3, react with 2 or more moles of boron fluoride to form Ph 3 CB 2 F 7 . Reactions take place rapidly and completely at low temperatures, except in the case of X = OCH 3 , where cleavage of the ether requires about 1 h at −30 °C. When X = Cl the other product is [Formula: see text]; for OH and OCH 3 the products are B(OH) 3 and B(OCH 3 ) 3 ·2BF 3 . The [Formula: see text] ion appears to be more stable than the [Formula: see text] or [Formula: see text] ions.

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