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its all about organometallic chemistry of zinc and copper metal

Preparations Homocuprate

Preparations Homocuprate reagents (Gilman reagent: R 2 CuLi, R 2 CuMgX) • widely used organocopper reagents. • prepared by reaction of copper(I) bromide or preferably copper(I) iodide with 2 equivalents of appropriate lithium or Grignard reagents in ether or THF • The initially formed (RCu) n are polymeric and insoluble in Et 2 O and THF but dissolve on addition of a second equivalent of RLi or RMgX. • The resultant organocuprates are thermally labile and thus are prepared at low temperatures.

Preparations Heterocuprate reagents • Since only one of the organic groups of homocuprates is usually utilized, a non-transferable group bonded to copper, such as RC≡C, 2-thienyl, PhS, t-BuO, R 2 N, Ph 2 P, or Me 3 SiCH 2 , is employed for the preparation of heterocuprate reagents. • These cuprates are usually thermally more stable (less prone toward β-elimination of Cu–H), and a smaller excess of the reagent may be used.

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