Thermal Disproportionation of Diphenylphosphine Oxide and 10H-Phenoxaphosphine 10-Oxides

Abstract

Diphenylphosphine oxide at 175° and 0.1 torr for one hour produced diphenylphosphinic anhydride and diphenylphosphine along with a small amount of tetraphenyldiphosphine. 10H-Phenoxaphosphine 10-oxides reacted similarly under these conditions except that the product ratios varied with ring substitution. At 100° and 0.1 torr 2,8-difluoro- 10H-phenoxaphosphine 10-oxide reacted differently than at 175° producing the diphosphine monoxide at the lower temperature. The products were identified by ³¹P NMR spectroscopy.