Beiträge zur Chemie des Phosphors, 78: 1,2,3‐Triphenyltriphosphan

Contributions to the Chemistry of Phosphorus, 78: 1,2,3‐Triphenyltriphosphane Among the disproportionation products of 1,2‐diphenyldiphosphane ( 1 ), 1,2,3‐triphenyltriphosphane ( 2 ) could be enriched up to the maximum concentration of ≈50% with respect to the total phosphorus. 2 was identified by the 31 P{ 1 H} NMR spectrum that exhibits, in the region of openchain triphosphanes, two A 2 B and one ABC spin system for the three diastereomers, of which the NMR parameters are reported. Contrary to results given in the literature, 2 is not stable at room temperature, but disproportionates to give lower and higher homologues of the series H(PPh) n H as well as cyclic phenylphosphanes, especially (PPh) 5 .