in dichloromethane soln. of SnCl4 (14.4 mmol) added at 0 °C to soln. of the sulfoxide (7.2 mmol); slowly warming to room temp.; refluxing (20 h); evapn. (rotary evaporator); SnMe2Cl2 removed (0.01 torr, 60 °C);recrystn. (CH2Cl2/hexane); elem. anal.; mol. wt. calc.: 527.46; mol. wt. found: 593.27 (isopiestic in CH2Cl2 at 22 °C);

in dichloromethane mixt. of the sulfoxide (6.7 mmol) and SnMe2Cl2 (13.5 mmol) in CH2Cl2 refluxed for 12 h; solvent removed (rotary evaporator); SnMe3Cl removed (0.01 torr, 60 °C); recrystn. (CCl4/hexane); elem. anal.; mol. wt. calc.: 486.6; mol. wt. found: 506.6 (isopiestic in CH2Cl2 at 22 °C);

sulfuric acid; dihydrogen peroxide in ethanol stirring for 5 h; addn. of petroleum ether, extn. with water; org. layer was dried, filtered, concd., product distilled; elem. anal.;