e/Zinc-copper couple

Information
has gloss	eng: Zinc-copper couple is an alloy of zinc and copper that is employed as a reagent in organic synthesis. The “couple” was popularized after the report by Simmons and Smith in 1959 of its application as an activated source of zinc required for formation of an organozinc reagent in the Simmons-Smith cyclopropanation of alkenes. . The couple has been widely applied as a reagent in other reactions requiring activated zinc metal. Zinc-copper couple does not refer to a rigorously defined chemical structure or alloy composition. The couple may contain varying proportions of copper and zinc; the zinc content is typically greater than 90%, although an alloy containing similar proportions of zinc and copper is used in some cases. The couple is frequently prepared as a darkly-colored powder and is slurried in an ethereal solvent prior to being used in slight excess relative to the substrate. Activation of zinc by copper is essential to the couple’s utility, but the origin of this effect is poorly documented. It is speculated that copper enhances reactivity of zinc at the surface of the alloy.
lexicalization	eng: zinc-copper couple
instance of	(noun) a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver reducing agent, reductant, reducer

Media
media:img	Cycloaddition with Dibromoketone.gif
media:img	Cyclopropanation of Alkene.gif
media:img	Iodomethylzinciodide generation.gif