✦ LIBER ✦

A New Asymmetric Synthesis of Tricarbonylchromium Complexes of ortho-Substituted Benzaldehydes. Preliminary communication

✍ Scribed by E. Peter Kündig; Ronggang Liu; Alberto Ripa

Book ID: 102258158
Publisher: John Wiley and Sons
Year: 1992
Tongue: German
Weight: 252 KB
Volume: 75
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19920750818

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✦ Synopsis

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.

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