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Abstract
The reaction of tris(tert-butyl)phenylphosphine with some hydrogen acceptors has been investigated. Triphenylcarbenium hexafluorophosphate allows to obtain a phosphonium salt: the possibility of preliminary formation of phosphenium with a P[sbnd]H bond during this reaction is discussed. With methyltrifluoromethanesulfonate, two pentacoordinated phosphorus compounds are isolated. Diethylazodicarboxylate gives rise to a σ3, λ5-phosphorane. The transient formation of phosphinidene and of 1,2-bis(ethylcarboxylate) 3-tris(tert-butyl)phenyldiazaphosphirine is discussed.