13C NMR spectra and enol—enol tautomerism in crystalline keto—enols

The tautomeric equilibrium in crystals of five β-diketones has been studied by 13C NMR spectroscopy using “magic angle” spinning techniques. The results are compared with literature data for the corresponding 10% solutions. The difference between chelate enol—enol equilibria in crystalline and disso...

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Bibliographic Details
Published in:Journal of molecular structure 1990-04, Vol.221, p.309-313
Main Authors: Kol'tsov, A.I., Elkin, A.A., Zheglova, Donka Kh
Format: Article
Language:English
Subjects:
Chemistry
Condensed benzenic and aromatic compounds
Exact sciences and technology
Organic chemistry
Preparations and properties
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Summary:The tautomeric equilibrium in crystals of five β-diketones has been studied by 13C NMR spectroscopy using “magic angle” spinning techniques. The results are compared with literature data for the corresponding 10% solutions. The difference between chelate enol—enol equilibria in crystalline and dissolved keto—enols was found to be small in some cases and significant for systems containing an additional proton donating group able to form an intermolecular hydrogen bond.
ISSN:0022-2860
1872-8014
DOI:10.1016/0022-2860(90)80415-G