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Tautomeric Equilibria in Solutions of 2-Phenacylbenzimidazoles
Joint Authors
Skotnicka, Agnieszka
Czeleń, Przemysław
Gawinecki, Ryszard
Source
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-02-03
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
Detailed NMR spectral analysis of DMSO-d6 solutions of the series of substituted 2-phenacylbenzimidazoles (ketimine form, K) reveals two from three tautomeric forms.
Integrals of the 1H NMR signals are used in establishing the molar ratio of tautomers.
The experimental analyses are supported by quantum-chemical calculations, which satisfactorily reproduced the experimental trends.
Although the reported semiempirical quantum-chemical calculations show that enaminone E, i.e., 2-(1,3-dihydro-2H-benzo[d]imidazol-2-ylidene)-1-phenylethan-1-one, was thermodynamically most stable, the results of MP2 ab initio calculations reveal the following order of stability: ketimine > enolimine > enaminone (substituents do not affect this sequence).
13C CPMAS NMR spectral data reveal that in the crystalline state the enolimine tautomer O is predominant in the p-CH3 and p-NO2 substituted congeners.
American Psychological Association (APA)
Skotnicka, Agnieszka& Czeleń, Przemysław& Gawinecki, Ryszard. 2019. Tautomeric Equilibria in Solutions of 2-Phenacylbenzimidazoles. Heteroatom Chemistry،Vol. 2019, no. 2019, pp.1-9.
https://search.emarefa.net/detail/BIM-1155651
Modern Language Association (MLA)
Skotnicka, Agnieszka…[et al.]. Tautomeric Equilibria in Solutions of 2-Phenacylbenzimidazoles. Heteroatom Chemistry No. 2019 (2019), pp.1-9.
https://search.emarefa.net/detail/BIM-1155651
American Medical Association (AMA)
Skotnicka, Agnieszka& Czeleń, Przemysław& Gawinecki, Ryszard. Tautomeric Equilibria in Solutions of 2-Phenacylbenzimidazoles. Heteroatom Chemistry. 2019. Vol. 2019, no. 2019, pp.1-9.
https://search.emarefa.net/detail/BIM-1155651
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1155651