in acetonitrile 15 h, room temp.; evapn. of solvent, sublimation of Me2SnCl2 under oil pump vav., residue washed with ether, recrystd. from CH2Cl2;

methyllithium in not given equimolar amts. of MeLi and stannylsulfurdiimide reacting under Ar, Me4Sn removing by fractional distn.; identified by elem. anal., IR and NMR spectra;