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Cu_Zn_Organometallics

its all about organometallic chemistry of zinc and copper metal

Reaction of Organozinc

Reaction of Organozinc compounds Cyclopropanation • characteristics: – stereospecificity (retention of olefin geometry); – tolerance of a variety of functional groups, such as Cl, Br, OH, OR, CO 2 R, C=O, and CN; – the syn-directing effect of hydroxyl and ether functions; – chemoselectivity—zinc carbenoids are electrophilic and react chemoselectively with the more nucleophilic double bond in dienes and polyenes.

Reaction of Organozinc compounds Cyclopropanation modifications of Simmons-Smith : • Furukawa’s reagent, (iodomethyl)zinc derived from diethylzinc and diiodomethane, or its modification using chloroiodomethane instead of diiodomethane, allows more flexibility in the choice of solvent. • The reagent is homogeneous and the cyclopropanation of olefins can be carried out in noncomplexing solvents, such as dichloromethane or 1,2-dichloroethane, which greatly increase the reactivity of the zinc carbenoids.

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