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Title: Reactivity of the CpMn(CO)2-XR bond [X = Cl, Br]: A kinetic study using rapid-scan FTIR spectroscopy
Authors: Bengali, A.A.
Fan, W.Y. 
Issue Date: 10-Nov-2008
Citation: Bengali, A.A., Fan, W.Y. (2008-11-10). Reactivity of the CpMn(CO)2-XR bond [X = Cl, Br]: A kinetic study using rapid-scan FTIR spectroscopy. Organometallics 27 (21) : 5488-5493. ScholarBank@NUS Repository.
Abstract: The mechanism and energetics of the displacement of dihaloalkanes from the photolytically generated CpMn(CO)2-XR (X = Cl, Br) complexes by 2,6-lutidine have been studied using rapid-scan FTIR. The substitution reactions proceed through an Id mechanism, and theoretical calculations indicate that the Mn-XR bond is mostly broken in the transition state. Activation enthalpies of 16-17 kcal/mol for the Mn-ClR and 18-19 kcal/mol for the Mn-BrR complexes are only slightly lower than previous thermodynamic measurements of the Mn-haloalkane bond dissociation enthalpies. The rate of displacement of bromoalkanes was found to be ∼10 times slower than for the analogous chloroalkanes. Ab initio calculations suggest that this difference in reactivity is primarily due to a more stable interaction between the Mn center and bromoalkanes. © 2008 American Chemical Society.
Source Title: Organometallics
ISSN: 02767333
DOI: 10.1021/om8005036
Appears in Collections:Staff Publications

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