Synthesis and structural investigation of new isothiochromen-4-one 2,2-dioxide derivatives
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  • 作者:Olena O. Shyshkina ; Volodymyr V. Medviediev ; Yulian M. Volovenko…
  • 关键词:Isothiochromen ; 4 ; one 2 ; 2 ; dioxide ; Derivatives ; Electrophilic substitution reactions ; Tautomerism ; X ; ray diffraction
  • 刊名:Structural Chemistry
  • 出版年:2016
  • 出版时间:February 2016
  • 年:2016
  • 卷:27
  • 期:1
  • 页码:273-280
  • 全文大小:1,044 KB
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  • 作者单位:Olena O. Shyshkina (1)
    Volodymyr V. Medviediev (2)
    Yulian M. Volovenko (1)
    Oleg V. Shishkin (2) (3)

    1. Department of Chemistry, Taras Shevchenko National University of Kyiv, Lva Tolstoho Street, 12, Kyiv, 01033, Ukraine
    2. SSI “Institute for Single Crystals”, National Academy of Science of Ukraine, 60 Nauky ave., Kharkiv, 61001, Ukraine
    3. Department of Chemistry, V. N. Karazin Kharkiv National University, 4 Svobody sq, Kharkiv, 61122, Ukraine
  • 刊物类别:Chemistry and Materials Science
  • 刊物主题:Chemistry
    Computer Applications in Chemistry
    Physical Chemistry
    Theoretical and Computational Chemistry
  • 出版者:Springer Netherlands
  • ISSN:1572-9001
文摘
This article presents a combined experimental and computational study of novel isothiochromene 2,2-dioxide derivatives, which were synthesized by the electrophilic substitution reactions. The compounds have been studied by NMR, IR spectroscopy and single-crystal X-ray analysis. According to X-ray diffraction data, the six-membered ring of 6 adopts a distorted half-chair conformation, but in case of compounds 7 and 8, we have a twist-boat conformation of the six-membered ring with deviation of the S1 and C8 atoms from the mean plane of the remaining atoms of the ring, respectively. Results of quantum-chemical calculations of possible isomers and tautomers of the isolated oxime 8 and azo compounds 10 at the B3LYP/aug-cc-pVDZ level indicate that the oxime-oxo tautomer (8a) is more stable than the nitroso-hydroxy tautomer (8b) in agreement with the crystal data and that the keto tautomer (II) is more stable than the hydroxyl tautomer (I) and zwitterion tautomer (III), because of a strong intramolecular hydrogen bond N–H···O. Keywords Isothiochromen-4-one 2,2-dioxide Derivatives Electrophilic substitution reactions Tautomerism X-ray diffraction

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