Elsevier

Polyhedron

Volume 13, Issue 20, October 1994, Pages 2825-2829
Polyhedron

Selective cyanation/bromination of coordinated β-diketones using CNBr as a new reagent

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Abstract

Cyanogen bromide was used as a new twin purpose reagent for bromination or cyanation of β-diketonates of many transition and some non-transition metals. Whereas inert and less labile chelates of CrIII, CoIII, AlIII and BeII yielded γ-brominated reaction products, the labile ones of CoII, NiII, MgII and CuII gave γ-cyanated diketonates. VOIV and FeIII chelates yielded γ-bromo products in methanol and γ-cyano products in chloroform. The reagent is the first cyanating agent for β-diketonates. CNI was also used as a new reagent for β-diketonates and the reactions were compared with those of CNBr.

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