A New Asymmetric Synthesis of Tricarbonylchromium Complexes of <i>ortho</i>‐Substituted Benzaldehydes. Preliminary communication

Abstract

Abstract ortho ‐Substituted [Cr(CO) 3 (benzaldehyde)] complexes are obtained via nucleophilic addition of alkyl‐ and aryllithium reagents to a [Cr(CO) 3 (phenylmethaneimine)] complex followed by endo ‐hydride abstraction with triphenylmethyl cation. This sequence, when carried out with a [Cr(CO) 3 (benzaldehyde SAMP hydrazone)] complex affords substituted derivatives (Me, Bu, Ph, vinyl) with high (⩾97%) diastereoselectivity and, after hydrolysis, ortho ‐ substituted [Cr(CO) 3 (benzaldehyde)] ((S)‐ 1 ) complexes of high enantiomeric purity.