Preparation of a dibenzo[b,e]phosphorin. Selective phosphine oxide reduction by trichlorosilane

Abstract
5,10-Dihydro-5-phenyldibenzo[b,e]phosphorin-10-one 5-oxide (3) has been prepared by the action of polyphosphoric acid on o-diphenylphosphinylbenzoic acid, and has been selectively reduced by trichlorosilane to the ketophosphine (4).

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