Novel photoinduced asymmetric synthesis of Λ-[Co(acac)3] from Co(acac)2(H2O)2 and Hacac catalysed by racemic complexes of Δ- and Λ-[Ru(menbpy)3]2+{menbpy = 4,4′-Di-[(1R,2S,5R)-(–)-menthoxycarbonyl)]-2,2′-bipyridine; Hacac = pentane-2,4-dione}

Abstract

The asymmetric synthesis of M(C₃)-Λ-[Co(acac)3] has been realized by the oxidation of Co(acac)₂(H₂O)₂ and Hacac with theracemicphotocatalystsof [Ru(menbpy)₃]²⁺{menbpy = 4,4′-di-[(1R, 2S,5R)-(–)-menthoxycarbonyl]-2,2′-bipyridine} which predominates the helical chirality of M(C₃)-Δ-[Ru(Menbpy)₃]²⁺; the extent of the asymmetric induction by the helical photocatalyst has been enlarged by lowering the % v/v of EtOH-H₂O or by raising the molar ratio of [Hacac]/[Co(acac)₂(H₂O)₂].