KOH in 1,4-dioxane; water byproducts: KI; addn. of organic compound in dioxane to an aq. soln. of Hg-compound andKOH, stirring for 6 h at 20-23°C, leaving overnight; addn. of water, extn. (pentane), washing extract (water), drying (MgSO4), removing solvent, passing through a layer of silica gel, elem. anal.;

bromine in chloroform T=-40°C; 0.5 h;