Theoretical investigations into the enantiomeric and racemic forms of α-(trifluoromethyl)lactic acid

Literature Information

Publication Date 2010-10-14
DOI 10.1039/C0CP01155J
Impact Factor 3.676
Authors

Ralf Tonner, Vadim A. Soloshonok, Peter Schwerdtfeger


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Abstract

There are many different hypotheses on the origin of biomolecular homochirality. One possible scenario concerns the enantiomeric enrichment of a nearly racemic solid via self-disproportionation of enantiomers. In particular, in a recent paper Soloshonok and co-workers showed a first example of optical self-purification of α-(trifluoromethyl)lactic acid by sublimation [V. A. Soloshonok et al., J. Am. Chem. Soc. 2007, 129, 12112]. Here we present detailed theoretical studies of α-(trifluoromethyl)lactic acid in the solid state as well as in the gas-phase dimeric form. The calculations of energy differences between dimers show that in the solid state the enantiomeric pure compound is energetically preferred, while in the gas phase the equilibrium shifts towards the racemic mixture although thermodynamic corrections cannot be neglected, thus providing a detailed microscopic explanation for the enantio-purification process for the first time.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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