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Direct determination of absolute configuration: a vibrational circular dichroism study on dimethyl-substituted phenyloxiranes synthesized by Shi epoxidation

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Fristrup, P.
Lassen, P.
Tanner, D.
Jalkanen, Karl
Date
2008
Type
Journal Article

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Fristrup, Peter and Lassen, Peter Rygaard and Tanner, David and Jalkanen, K. J.. 2008. Direct determination of absolute configuration: a vibrational circular dichroism study on dimethyl-substituted phenyloxiranes synthesized by Shi epoxidation. Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta) 119: pp. 133-142.
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Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta)
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Department of Applied Chemistry
School of Science and Computing
Faculty of Science and Engineering
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The original publication is available at : www.springerlink.com

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Abstract

The three possible dimethylsubstituted phenyloxiranes (cis, trans and geminal) were synthesized in both racemic (mCPBA) and enantiomerically enriched forms (Shi epoxidation) and subjected to a vibrational circular dichroism study. The experimental spectra were compared to theoretical spectra obtained using DFT/B3LYP calculations, and the differences between experiment and theory are discussed. The absolute configuration at the benzylic position was established as being (R), (S) and (R) for the cis, trans and geminal dimethylsubstituted phenyloxiranes, respectively. In all three cases the configuration of the major enantiomer was in accordance with a simple transition state model based on the spiro reaction mode.