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Issue 36, 2017, Issue in Progress
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Carbonic acid monoethyl ester as a pure solid and its conformational isomerism in the gas-phase

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Abstract

The monoesters of carbonic acid are deemed to be unstable and decompose to alcohol and carbon dioxide. In spite of this, we here report the isolation of the elusive carbonic acid monoethyl ester (CAEE) as a pure solid from ethanolic solutions of potassium bicarbonate. The hemiester is surprisingly stable in acidic solution and does not experience hydrolysis to carbonic acid. Furthermore, it is also stable in the gas phase, which we demonstrate by subliming the hemiester without decomposition. This could not be achieved in the past for any hemiester of carbonic acid. In the gas phase the hemiester experiences conformational isomerism at 210 K. Interestingly, the thermodynamically favored conformation is only reached for the torsional movement of the terminal ethyl group, but not the terminal hydrogen atom on the millisecond time scale. Accordingly, IR spectra of the gas phase trapped in an argon matrix are best explained on the basis of a 5 : 1 mixture of monomeric conformers. Our findings necessitate reevaluation of claims of the formation of a carbonic acid polymorph in methanolic solution, which is the subject of a forthcoming publication.

Graphical abstract: Carbonic acid monoethyl ester as a pure solid and its conformational isomerism in the gas-phase

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Publication details

The article was received on 07 Mar 2017, accepted on 10 Apr 2017 and first published on 21 Apr 2017


Article type: Paper
DOI: 10.1039/C7RA02792C
RSC Adv., 2017,7, 22222-22233
  • Open access: Creative Commons BY-NC license
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    Carbonic acid monoethyl ester as a pure solid and its conformational isomerism in the gas-phase

    J. Bernard, E. Köck, R. G. Huber, K. R. Liedl, L. Call, R. Schlögl, H. Grothe and T. Loerting, RSC Adv., 2017, 7, 22222
    DOI: 10.1039/C7RA02792C

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