trimethylsilylation reagent; mercury(II) cyanide; mercury(I) monobromide 2) benzene, 3.5 h, heating; Yield given. Multistep reaction. Yields of byproduct given;

trimethylsilylation reagent; tin(IV) chloride 2) acetonitrile, 24 h, room temp.; Yield given. Multistep reaction. Yields of byproduct given;