mercury dichloride in acetone byproducts: MeHgCl; dropwise addn. of HgCl2 to Sn compd. at 0°C, stirring (20°C, 3 h); distn. off of acetone, extn. (CCl4), evapn. of extract, fractionation; elem. anal.;

in diethyl ether 0°C; treatment with Seignett salt;