Novel bis(2,6-dimesityl-4-methylphenyl)phosphaarsene was synthesized b
y the coupling reaction of 2,6-dimesityl-4-methylphenylphosphine with
dichloro(2,6-dimesityl-4-methylphenyl)arsine in the presence of 1,8-di
azabicyclo[5.4.0]undec-7-ene and isolated as stable crystals. The radi
cal anion generated by the sodium metal reduction of the phosphaarsene
was investigated by X-band EPR.