in ethanol byproducts: sodium chloride; to soln. of Sn-compd. in abs. alc. was added ligand, mixt. refluxed for 3-4 h, concd. to half the vol., mixt. cooled, NaCl filtered, benzene added, mixt. refluxed for 2 h (trap), NaCl filtered, repetition of procedure until NaCl is completely removed; solvents were removed completely, residue dried in vacuo; complex recrystd. from ethanol; elem. anal.;