triethylamine in tetrachloromethane byproducts: triethylammonium chloride; HSCH2CH2Si(OEt)3 and Et3N in CCl4 treated with Bu3SnCl, stirred at roomtemp. for 24 h; filtered, washed with 5percent CH3COOH, dried over Na2SO4, fractionally distd. in vac.; elem. anal.;