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Chemical equilibria and kinetics in aqueous solutions of zymonic acid

Perkins, Russell J., Shoemaker, Richard K., Carpenter, Barry K. and Vaida, Veronica 2016. Chemical equilibria and kinetics in aqueous solutions of zymonic acid. Journal of Physical Chemistry A 120 (51) , pp. 10096-10107. 10.1021/acs.jpca.6b10526

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Abstract

The chemistry of pyruvic acid is of great interest due to its essential role in metabolism for all life and its role in atmospheric chemistry. Pyruvic acid under a wide range of conditions, including normal storage conditions, will spontaneously dimerize to form zymonic acid. We isolated zymonic acid and, using a variety of 1D and 2D NMR techniques, identified it as a single structure as a solid or dissolved in DMSO. When in aqueous solution, however, we identified a mixture of five different tautomers and hydrates in equilibrium with each other with no single dominant form. The kinetics of this conversion were studied in situ via NMR. The reactivity of the tautomers and hydrates in aqueous solution is investigated and discussed in terms of aqueous reaction mechanisms. There is strong evidence for a direct, reversible conversion from an enol to a geminal diol without passing through a ketone intermediate, which implies the reversible addition of water across a double bond under ambient conditions. Additionally, there is evidence for a base catalyzed lactone ring formation, which is in essence a base catalyzed esterification reaction. The equilibrium between pyruvic acid and its oligomers in aqueous solution is of consequence in the natural environment.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: American Chemical Society
ISSN: 1089-5639
Date of First Compliant Deposit: 22 October 2018
Date of Acceptance: 1 December 2016
Last Modified: 27 Oct 2018 07:57
URI: http://orca-mwe.cf.ac.uk/id/eprint/116058

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