Bis(organochalcogenyl)mercury compounds have been long known, but aside from applications related to inorganic chemistry l or solid-state chemistry in the development of semiconductors, 2 no organic chemistry has been associated with this class of compounds. In contrast, related parent compounds such as (organochalcogenyl) cadmium, 3 lead, 4 thallium, 5 and silver 6 reagents have proved to be useful sources of nucleophilic ...