Absolute Asymmetric Synthesis: Viedma Ripening of [Co(bpy)3]2+ and Solvent‐Free Oxidation to [Co(bpy)3]

Publisher： John Wiley & Sons Inc

E-ISSN： 1521-3765|21|30|10630-10633

ISSN： 0947-6539

Source： CHEMISTRY - A EUROPEAN JOURNAL, Vol.21, Iss.30, 2015-07, pp. : 10630-10633

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Abstract

AbstractSyntheses of [Co(bpy)3]2+ yield racemic solutions because the Δ‐ and Λ‐enantiomers are stereochemically labile. However, crystallization and attrition‐enhanced deracemization can give homochiral crystal batches of either handedness in quantitative yield. Subsequently, solvent‐free oxidation with bromine vapour fixes the chirality because [Co(bipy)3]3+ does not enantiomerize in solution at ambient temperature. This combination of Viedma ripening and the labile/inert CoII/CoIII couple constitutes a convenient method of absolute asymmetric synthesis.

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