in dichloromethane 1 mol of bis(dimethylchlorostannyl)methane, CH2Cl2 and 0.5 mol SnCl4 placed into flask, warmed, solvent removed (vac.), heated at 60°C for 36 h; stirred under 0.01 Torr with warming to 60°C, recrystd. (CCl4); elem. anal.;

in dichloromethane CH2Cl2 added to bis(dimethylchlorostannyl)methane, excess of SnCl4 added slowly, agitated for 5 min, concd. (vac.), heated at 60°C overnight; warmed to 60°C for 0.5 h with slow reducing pressure to 0.01 Torr, recrystd. (CCl4); elem. anal.;

KI in acetone byproducts: NaCl; bis(dimethylchlorostannyl)methane, KI and acetone placed into flask, stirred overnight; concd., treated with CH2Cl2, filtered, evapd. (vac.), placed under 0.01Torr while mixt. stirred, solidified on standing, dissolved in petroleum ether with warming, filtered, concd. (vac.);

in dichloromethane CH2Cl2 added to bis(dimethylchlorostannyl)methane, excess of SnCl4 added slowly, agitated for 5 min, concd. (vac.), heated at 60°C overnight; warmed to 60°C for 0.5 h with slow reducing pressure to 0.01 Torr, recrystd. (CCl4); elem. anal.;

in dichloromethane CH2Cl2 added to bis(dimethylchlorostannyl)methane, excess of SnCl4 added slowly, agitated for 5 min, concd. (vac.), heated at 60°C overnight; warmed to 60°C for 0.5 h with slow reducing pressure to 0.01 Torr, recrystd. (CCl4); elem. anal.;

in dichloromethane 1 mol of bis(dimethylchlorostannyl)methane, CH2Cl2 and 0.5 mol SnCl4 placed into flask, warmed, solvent removed (vac.), heated at 60°C for 36 h; stirred under 0.01 Torr with warming to 60°C, recrystd. (CCl4); elem. anal.;