Direct catalytic transformation of white phosphorus into arylphosphines and phosphonium salts

Phosphorus compounds are ubiquitous in the chemical sciences, finding applications throughout industry and academia. Of particular interest to synthetic chemists are organophosphorus compounds, which contain P-C bonds. However, state-of-the-art processes for the synthesis of these important materials rely on an inefficient, stepwise methodology involving initial oxidation of white phosphorus (P₄) with hazardous chlorine gas and the subsequent displacement of chloride ions. Catalytic P₄ organofunctionalisation reactions have remained elusive, as they require multiple P-P bond breaking and P-C bond formation events to break down the P₄ core, all of which must occur in a controlled manner. Herein, we describe an efficient transition metal-catalyzed process capable of forming P-C bonds from P₄. Using blue light photocatalysis, this method directly affords valuable triarylphosphines and tetraarylphosphonium salts in a single reaction step.