Younes Valadbeigi and Hossein Farrokhpour Theoretical study on keto–enol tautomerism and isomerization in pyruvic acid International Journal of Quantum Chemistry 113
Pyruvic acid is involved in the metabolism of carbohydrates. Keto–-enol tautomerism in pyruvic acid can involve the transformation of the more stable keto form into the enol form. This is catalyzed by water, acting synchronously as a proton donor and proton acceptor. This study finds that a transition state structure with a hexagonal ring is formed, which is more stable than a tetragonal ring formed in the absence of water.
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