Further studies in the chemistry of 2,3-dihydro-1,2,3-triphenyl-1H-1,2,3-benzotriphosphole and related compounds. Part II

Abstract

o-Phenylenebis(phenylphosphine)(II), now readily available, is a valuable precursor in the synthesis of several new heterocyclic systems having a benzene ring fused to a five- or six-membered ring containing at least two phosphorus atoms. The following heterocyclic systems (with phenyl substituents) have been prepared: the 1,2,3-benzotriphospholes (V; R = Me or Et); the 1,3,2-benzodiphospharsoles (VIII; R = Ph or Me); the 1,3-benzodiphosphole (X); the 1,4-benzodiphosphorins (XI) and (XXVII); and the dibenzo[c,g][1,2,5,6]-tetraphosphocin (XXIII). The chemistry and spectroscopic properties of these compounds have been investigated.

The mechanism of the alkaline hydrolysis of the 1,4-benzodiphosphorinium salt (XVI) to give the bis(phosphine oxide)(XVII) is discussed.