in methanol byproducts: NaCl; (N2); stirring a mixt. of tin compd. with excess of ligand in methanol at room temp. for 24 h; filtration, evapn.; elem. anal.;

in benzene byproducts: H2O; refluxing a mixt. of tin compd. with excess ligand in C6H6 with Dean andStark apparatus for 2 h; evapn.;