1-propanol in methanol; benzene byproducts: H2O; di-n-butyltin oxide refluxed with PrOH for 4 h; azeotrope (C6H6/H2O/PrOH) removed; mixt. cooled to room temp.; soln. of MePO(OH)2 in molar ratio1:2 in benzene and MeOH slowly added; stirred at room temp. for 18 h; filtered off; solvent removed (vac.); elem. anal.;

in methanol; water soln. of ligand in H2O was added with stirring to soln. of Sn-complex in MeOH, stirred for 5 h at room temp.; filtered, washed with EtOH, dried under vac. at 20°C for 10 h; elem. anal.;

in acetone soln. of ligand in acetone was added with stirring to soln. of Sn-complex in acetone, stirred for several h at room temp.; filtered, washed with EtOH, dried under vac. at 20°C for 10 h;

in acetone soln. of ligand in acetone was added with stirring to soln. of Sn-complex in acetone, stirred for several h at room temp.; filtered, washed with EtOH, dried under vac. at 20°C for 10 h;