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. 2020 Aug 7;13(16):3491. doi: 10.3390/ma13163491

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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500 MHz ¹H NMR spectra of a solution (a) containing 15 mg of py₂CO dissolved in 0.5 mL of D₂O (99.8%), (b) solution (a) + 10 μL of 5% DCl/D₂O, (c) solution (b) + 25 μL of 5% DCl/D₂O, showing changes in the equilibrium of the keto carbonyl group (py₂CO) to gem-diol (py₂CO·H₂O).

500 MHz ¹H NMR spectra of a solution (a) containing 15 mg of py₂CO dissolved in 0.5 mL of D₂O (99.8%), (b) solution (a) + 10 μL of 5% DCl/D₂O, (c) solution (b) + 25 μL of 5% DCl/D₂O, showing changes in the equilibrium of the keto carbonyl group (py₂CO) to gem-diol (py₂CO·H₂O).