Author
Valeriy V. Alekseyev
Bio: Valeriy V. Alekseyev is an academic researcher from Military Medical Academy. The author has contributed to research in topics: Tautomer & Ketone. The author has an hindex of 6, co-authored 11 publications receiving 133 citations.
Topics: Tautomer, Ketone, Ring (chemistry), Deprotonation, Pyridine
Papers
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TL;DR: In this paper, 32 1,2,3,4-tetrahydroquinazoline derivatives were synthesized by the reaction of 2-aminomethylaniline with aldehydes and ketones and their ring-chain tautomerism was studied by 1H, 13C and 15N NMR spectroscopy.
45 citations
29 citations
TL;DR: The condensation products from 4,4-dimethyl- and 2,4, 4-trimethylthiosemicarbazides and aldehydes or ketones, as well as those from 2-methyl-and 2-4-disubstituted thiose-micarazone structures have been investigated in this paper.
22 citations
TL;DR: A classification and methodology of molecular design of ring-chain-ring (ring-ring) tautomeric systems by superposition of ringchain equilibria in a structure of one molecule are considered in this paper.
Abstract: A classification and methodology of molecular design of ring—chain—ring (ring—ring) tautomeric systems by superposition of ring—chain equilibria in a structure of one molecule are considered.
14 citations
TL;DR: In this article, the three-component equilibrium between one linear and two cyclic (1,3,4-thiadiazolidine and 1,2,4triazoline) forms was obtained for trifluoroacetic acid.
13 citations
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280 citations
TL;DR: The results reported here for imines open wide perspectives for the implementation of such features in multifunctional molecules toward the design of molecular devices presenting a complex combination of motional and constitutional dynamic behaviors.
Abstract: The formation and exchange processes of imines of salicylaldehyde, pyridine-2-carboxaldehyde, and benzaldehyde have been studied, showing that the former has features of particular interest for dynamic covalent chemistry, displaying high efficiency and fast rates. The monoimines formed with aliphatic α,ω-diamines display an internal exchange process of self-transimination type, inducing a local motion of either “stepping-in-place” or “single-step” type by bond interchange, whose rate decreases rapidly with the distance of the terminal amino groups. Control of the speed of the process over a wide range may be achieved by substituents, solvent composition, and temperature. These monoimines also undergo intermolecular exchange, thus merging motional and constitutional covalent behavior within the same molecule. With polyamines, the monoimines formed execute internal motions that have been characterized by extensive one-dimensional, two-dimensional, and EXSY proton NMR studies. In particular, with linear poly...
138 citations
TL;DR: The ring-chain tautomeric equilibria of 1,3-X,N-heterocycles have been extensively studied in the literature as discussed by the authors, including substituent effects on the tautomers.
91 citations
68 citations
TL;DR: Three novel complexes (1, 3 and 4) ligating N-substituted isatin thiosemicarbazone derivatives have been synthesized and their structural and biological characteristics have been compared with those of the known analogs.
63 citations