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Isothiocyanates and Their Synthetic Producers. XI. Study of Infrared and Ultraviolet Spectra of 3-Substituted 2-Thioxo-4-oxo-3,4-dihydro-2H-1,3-benzoxazines and N-Substituted О - (2 -Methoxy carbonylphenyl) monothiourethanes

M. Novotná, P. Kristian, and J. Bernát

Department of Organic Chemistry, Faculty of Natural Sciences, P. J. Šafárik University, Košice


Abstract: Infrared and ultraviolet spectra of ten 3-substituted 2-thioxo-4-oxo-3,4-dihydro-2H-1,3-benzoxazines and of fifteen N-substituted 0-(2-methoxycarbonylphenyl) monothiourethanes as their direct intermediates are described. The obtained results make possible to distinguish simply the studied compounds from each other qualitatively. For the NCS group of monothiourethanes, two intensive absorption bands in the region ~ 1530 and ~ 1380 cm-1 are typical. With the benzoxazine derivatives the first band is absent. In contrast to monothiourethanes, the benzoxazine derivatives are characterized in the u.v. region by two absorption bands at ~ 275 and ~ 300 nm. The nature and the position of absorption bands of the studied compounds in dependence on their structures are discussed in this work.

Full paper in Portable Document Format: 266a543.pdf


Chemical Papers 26 (6) 543–550 (1972)

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