in neat (no solvent) byproducts: ((CH3)3)2PSiCl3; dropwise addn. of Si2Cl6 to ((CH3)3)2PGe(CH3)3 at 0°C with stirring; stirring for 3 h at room temp.;; crystn. from toluene;;

Si2Cl6 3 h; Ambient temperature;

Si2Cl6 3 h; Ambient temperature;