in diethyl ether; toluene soln. of ligand in Et2O was added dropwise to soln. of SnCl4 in toluene at room temp. under N2, left 15 h at room temp., refluxed for 3 h, cooled to 0°C; decomposed with satd. soln. of NH4Cl, sepd., aq. layer was extd. with Et2O, dried over MgSO4, solvent was removed under reduced pressure, recrystd. from n-heptane;

in diethyl ether; toluene soln. of ligand in Et2O was added dropwise to soln. of SnCl4 in toluene at 0°C under N2, stirred for 1.5 h at room temp., refluxed for 3 h, left for 15 h at room temp., cooled to 0°C; decomposed with satd. soln. of NH4Cl, sepd., aq. layer was extd. with Et2O, dried over MgSO4, solvent was removed under reduced pressure;