Fluorophosphoranes: a new synthesis. Diequatorial four-membered ring in a difluorophosphorane

Abstract
Reactions of trisubstituted phosphines with bis(trifluoromethyl) peroxide and bis(trifluoromethyl) disulphide proceed rapidly at –78° to give difluorophosphoranes, one of which (II) exists as a slowly equilibrating mixture at low temperatures.

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