Iodomethylzinc iodide
Iodomethylzinc iodide is the active reagent in the Simmons–Smith reaction. For example, iodomethylzinc iodide, formed in situ from diiodomethane and a zinc-copper couple reacts with cyclohexene to give norcarane.
Iodomethylzinc iodide may also be generated by the reaction of diazomethane with zinc iodide, or by the reaction of methylene iodide with diethylzinc.
