in tetrahydrofuran byproducts: trimethylchlorostannane; dropwise addn. of triisopropylchlorosilane in THF at room temperature to a soln. of ((CH3)3Sn)2CN2 in THF; stirring for 1 h; removing the solvent and byproduct at room temperature and 1E-2 mmHg;; distillation; elem. anal.;;

in tetrahydrofuran