in tetrachloromethane Ar-atmosphere; dropwise addn. of 2 equiv. of Br2 to Sn-compd. at 0°C, stirring (room temp., 1-2 h); evapn., chromy. (hexane, then C6H6); elem. anal.;

in tetrachloromethane Ar-atmosphere; dropwise addn. of 2 equiv. of Br2 to Sn-compd. at 0°C, stirring (room temp., 2 h); evapn., chromy. (hexane, then C6H6);

in neat (no solvent) byproducts: (CH3)2SnBr2; heating in a closed tube at 150°C, 3 days;; impure, 20 percent (CH3)2SnBr2;;

2: neat (no solvent) View Scheme