Stephen C. Case-Green
Kinetic resolution of the chiral iron acetyl complexes [Fe(CO) (η5-C5H5)(L)COCH3] [L= PPh 3, P(p-tolyl)3] via aldol reactions with camphor
Case-Green, Stephen C.; Costello, James F.; Davies, Stephen G.; Heaton, Nicholas; Hedgecock, Charles J. R.; Humphreys, Vanessa M.; Metzler, Michael R.; Primes, Jeremy C.
Authors
James Costello James.Costello@uwe.ac.uk
Senior Lecturer
Stephen G. Davies
Nicholas Heaton
Charles J. R. Hedgecock
Vanessa M. Humphreys
Michael R. Metzler
Jeremy C. Primes
Abstract
The chiral iron acetyl complexes [Fe(CO)(η5-C 5H5)(L)COCH3] [L = PPh3, P(p-tolyl)3] have been kinetically resolved via aldol reactions involving their derived lithium enolates and camphor in the presence of lithium chloride. With (1R)-(+)-camphor the faster reacting iron acetyl enantiomer had the (S)-configuration allowing the (R)-iron acetyls to be obtained after recovery of starting material and crystallisation. The corresponding (S)-iron acetyls can be obtained by a base-promoted reverse aldol reaction of the isolated products. A mechanistic rationale for the high enantiomeric discrimination is proposed which involves a chelation-controlled chair transition state with a disfavourable 1 -methyl to cyclopentadienyl interaction in the mismatched pairing.
Citation
Case-Green, S. C., Costello, J. F., Davies, S. G., Heaton, N., Hedgecock, C. J. R., Humphreys, V. M., …Primes, J. C. (1994). Kinetic resolution of the chiral iron acetyl complexes [Fe(CO) (η5-C5H5)(L)COCH3] [L= PPh 3, P(p-tolyl)3] via aldol reactions with camphor. Journal of the Chemical Society, Perkin Transactions 1, 933-941. https://doi.org/10.1039/P19940000933
Journal Article Type | Article |
---|---|
Publication Date | Jan 1, 1994 |
Journal | Journal of the Chemical Society, Perkin Transactions 1 |
Print ISSN | 1472-7781 |
Publisher | Royal Society of Chemistry |
Peer Reviewed | Peer Reviewed |
Issue | 8, 1994 |
Pages | 933-941 |
DOI | https://doi.org/10.1039/P19940000933 |
Keywords | kinetic, chiral iron acetyl, aldol reactions, camphor |
Public URL | https://uwe-repository.worktribe.com/output/1108694 |
Publisher URL | http://dx.doi.org/10.1039/P19940000933 |
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