Тип публикации: статья из журнала
Год издания: 2018
Идентификатор DOI: 10.1016/j.molstruc.2018.04.018
Ключевые слова: Nitrosopyrazoles, Aminopyrazoles, Acylation, Tautomerism
Аннотация: As a result of the chain of transformations from 1,3-butanedione with aryl and methoxy substituents through nitrosation and cyclization with hydrazine, the corresponding nitrosopyrazoles and aminopyrazoles were synthesized. According to this scheme, eight new previously unknown compounds were obtained. Their structures were establiПоказать полностьюshed by the methods of IR, UV, H-1 NMR, C-13 NMR spectroscopy and mass spectrometry. DFT method of quantum-chemical calculations showed that obtained aminopyrazoles can exist as two tautomers; it was also confirmed by NMR H-1 spectroscopy data. In the case of acylation, an isomer is formed, where aryl substituent takes place in the fifth, rather than in the third position of the pyrazole ring, as shown by the DFT calculations. (C) 2018 Elsevier B.V. All rights reserved.
Журнал: JOURNAL OF MOLECULAR STRUCTURE
Выпуск журнала: Vol. 1165
Номера страниц: 370-375
ISSN журнала: 00222860
Место издания: AMSTERDAM
Издатель: ELSEVIER SCIENCE BV