in tetrahydrofuran boiling, 4h;;

equimolar amts. of educts closed to sealed tube cooled to -78°C under N2, heated at 150°C for 2 h; (CH3)2SnCl2 removed by vac. sublimation, product distd. in high vac., further purification by recrystn. from hexane or CCl4;

arsenic(III) chloride