1998 reactions of organo-metal compounds

reactions of organo-metal compoundsO 0350

41 - 063Generation of Organozinc Carbenoids from Acetals and Ketals. —Acetals and ketals (I) are used as precursors for organozinc carbenoids whichare trapped by cyclohexene giving a mixture of diastereomers (III) and (IV). Inthe absence of trapping agents, a direct conversion to alkenes (VI) and (VIII)is obtained. The results show a dominating role of the acetal in the reaction.While acetal (Va) gives good yield, the analogous (Vb) is almost inert. —(MOTHERWELL, W. B.; O’MAHONY, D. J. R.; POPKIN, M. E.; TetrahedronLett. 39 (1998) 29, 5285-5288; Christopher Ingold Lab., Dep. Chem., Univ.Coll., London WC1H 0AJ, UK; EN)

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