Organohalides are treated with lithium metal to yield an organolithium, which is in turn treated with copper(I) iodide to yield the corresponding Gilman reagent.
Li Cul
RX → RLi → R2CuLi
Decide what lithium diorganocopper (Gilman) reagent is needed to prepare 1-methylcyclohexene from 1-bromocyclohexene. If a structure has a copper-lithium bond, draw the lithium ion in a separate sketcher.