in carbon disulfide byproducts: S(SPh)3, P(SPh)3; P4S3I2 (0.63 mmol) added to stirred soln. of SiMe3(SPh) (2.47 mmol) at 20 °C; resulting soln. stirred (15 min); soln. evapd. (vac., 20 °C) to leave a mixt. of P4S3, S(SPh)3, and P(SPh3);