title: Cp*Rh complexes with pyridyloxazolines: synthesis, fluxionality and applications as asymmetric catalysts for Diels-Alder reactions.
abstract: Half-sandwich complexes [RhCl(pymox)Cp*][SbF(6)](1-7)(pymox = pyridyloxazoline) have been synthesised as single diastereomers. Treatment of these with AgSbF(6) generates dications [Rh(OH(2))(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(OH(2))((i)Pr-pymox)Cp*](2+) with [X](-) gives [RhX((i)Pr-pymox)Cp*][SbF(6)](X = Br, I) as single diastereomers whilst reaction with 4-Mepy (4-methylpyridine) gives [Rh(4-Mepy)((i)Pr-pymox)Cp*][SbF(6)] as a mixture of diastereomers. Two complexes, [RhCl((i)Pr-pymox)Cp*][SbF(6)](3) and [RhCl(Bz-pymox)Cp*][SbF(6)](6) have been characterised by X-ray crystallography.
authors.affiliation: Department of Chemistry, University of Leicester, Leicester, UK LE1 7RH.
authors.forename: David L
authors.initials: DL
authors.lastname: Davies
authors.forename: John
authors.initials: J
authors.lastname: Fawcett
authors.forename: Shaun A
authors.initials: SA
authors.lastname: Garratt
authors.forename: David R
authors.initials: DR
authors.lastname: Russell