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Single diastereomer half-sandwich salicyloxazoline complexes of titanium and zirconium

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Gott, Andrew L., Clarke, Adam J., Clarkson, Guy J., Munslow, Ian J., Wade, A. R. and Scott, Peter (2008) Single diastereomer half-sandwich salicyloxazoline complexes of titanium and zirconium. Organometallics, Vol.27 (No.12). pp. 2706-2714. doi:10.1021/om8002027 ISSN 0276-7333.

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Official URL: http://dx.doi.org/10.1021/om8002027

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Abstract

A series of half-sandwich complexes [Cp*MLX2] (L = four optically pure kappa(2)-salicyloxazolines, M = Ti, Zr; X = Cl, Me) have been prepared via salt elimination and protonolysis routes. X-ray crystallographic analyses demonstrate that the complexes contain stereogenic metal centers as a result of diastereoselective coordination of the N-O ligand. This chirality persists in solution; NMR spectroscopic investigations revealed that for most members of both the Ti and Zr series a single diastereomeric species is present at all accessible temperatures. Systems with incomplete diastereoselection are also accessible by notionally moving the C-stereogenic center on the oxazoline ring to a position where its chirality is less well expressed in the structure of the complex. In one such case (for M = Zr) a lower limit barrier to epimerization of 80 kJ mol(-1) is estimated at high temperature, while for an analogous Ti complex no exchange between epimers could be observed on the NMR chemical shift time scale. In contrast, unsubstituted cyclopentadienyl series CpTiLX2 gives diastereomeric mixtures in most cases and undergoes thermally accessible exchange between epimers.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Engineering and Medicine > Science > Chemistry
Library of Congress Subject Headings (LCSH): Zirconium, Titanium, Chirality, Diastereoisomers
Journal or Publication Title: Organometallics
Publisher: American Chemical Society
ISSN: 0276-7333
Official Date: 23 June 2008
Dates:
DateEvent
23 June 2008Published
Volume: Vol.27
Number: No.12
Number of Pages: 9
Page Range: pp. 2706-2714
DOI: 10.1021/om8002027
Status: Peer Reviewed
Publication Status: Published
Funder: Engineering and Physical Sciences Research Council (EPSRC)

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