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Cu_Zn_Organometallics

its all about organometallic chemistry of zinc and copper metal

Preparations Dialkylzinc

Preparations Dialkylzinc (R 2 Zn) • oxidative addition of Zn metal to diiodomethane affords an iodomethylzinc iodide, tentatively assigned as ICH 2 ZnI (Simmons-Smith reagent), which is used for cyclopropanation of alkenes. • Alkyl group exchange between diethylzinc and diiodomethane produces the iodomethyl zinc carbenoid species, tentatively assigned as EtZnCH 2 I (Furukawa’s reagent).

Reaction of Organozinc compounds The Reformatsky Reaction • involves condensation of ester-derived zinc enolates with aldehydes or ketones to give corresponding β-hydroxy esters. • zinc enolates are generated by addition of an α-haloester in THF, DME, Et 2 O, benzene, or toluene to an activated zinc, such as a Zn-Cu couple or zinc obtained by reduction of zinc halides with potassium (Rieke zinc).

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