Since the discovery that copper(I) halides catalyze the conjugate addition of Grignard reagents in 1941, organocopper reagents have emerged as weakly basic, nucleophilic reagents f...
An organocopper can be made by transmetallating a grignard reagent. This also acts as a nucleophilillic carbanion:
Copper is less electropositive, so it produces a less-charged (or...