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13C NMR Study of 1-Substituted 2-Тhioхо-4(1H,ЗН)-quinazolinones Employing the 1D and 2D Methods

J. Imrich, T. Bušová, D. Koščik, and T. Liptaj

Department of Organic Chemistry, Faculty of Natural Sciences, P. J. Šafárik University, CS-041 67 Košice

 

Abstract: The 13C  and 1H  NMR spectra of the title compounds and their 2-oxo analogue were studied by one- and two-dimensional methods COSY and INEPT. The chemical shifts were unambiguously ascribed to compounds under investigation and the coupling constants J(H, C) of the 4-quinazolinone ring system were determined by the 2D-J selective INEPT. Relationship between localization of the multiple bond in the diazine ring and the 13C  chemical shift values is discussed. The obtained values allowed us to deduce the SCS increments of 2-thioxo-4(lH,3H)-quinazolinon-1-yl grouping on the aromatic ring.

Full paper in Portable Document Format: 472a102.pdf

 

Chemical Papers 47 (2) 102–105 (1993)

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