in neat (no solvent) equimolar amt. of SnCl4 and Si-comp. were mixed, mixt. was stirred at 220 °C for 15 h, cooled in an ice-bath for 0.5 h, heated again at 220 °C for 1.5 h; distn. at 77 °C/0.025 Hgmm, elem. anal.;