Issue 21, 2004

Cp*Rh complexes with pyridyloxazolines: synthesis, fluxionality and applications as asymmetric catalysts for Diels–Alder reactions

Abstract

Half-sandwich complexes [RhCl(pymox)Cp*][SbF6] (17) (pymox = pyridyloxazoline) have been synthesised as single diastereomers. Treatment of these with AgSbF6 generates dications [Rh(OH2)(pymox)Cp*]2+ which are fluxional at room temperature and which are enantioselective catalysts for the Diels–Alder reaction of methacrolein and cyclopentadiene. Treatment of the dication [Rh(OH2)(iPr-pymox)Cp*]2+ with [X] gives [RhX(iPr-pymox)Cp*][SbF6] (X = Br, I) as single diastereomers whilst reaction with 4-Mepy (4-methylpyridine) gives [Rh(4-Mepy)(iPr-pymox)Cp*][SbF6] as a mixture of diastereomers. Two complexes, [RhCl(iPr-pymox)Cp*][SbF6] (3) and [RhCl(Bz-pymox)Cp*][SbF6] (6) have been characterised by X-ray crystallography.

Graphical abstract: Cp*Rh complexes with pyridyloxazolines: synthesis, fluxionality and applications as asymmetric catalysts for Diels–Alder reactions

Article information

Article type
Paper
Submitted
11 Jun 2004
Accepted
09 Sep 2004
First published
01 Oct 2004

Dalton Trans., 2004, 3629-3634

Cp*Rh complexes with pyridyloxazolines: synthesis, fluxionality and applications as asymmetric catalysts for Diels–Alder reactions

D. L. Davies, J. Fawcett, S. A. Garratt and D. R. Russell, Dalton Trans., 2004, 3629 DOI: 10.1039/B408921A

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