caa a22 4500 46799062X CHVBK 20180323112543.0 cr unu---uuuuu 170328e19900101xx s 000 0 eng 10.1007/BF00506856 doi (NATIONALLICENCE)springer-10.1007/BF00506856 4H-3, 1-benzoxazines. 5. PMR and mass spectrometric study of 2,4-substituted 1,2-dihydro-4H-3, 1-benzoxazines [Elektronische Daten] [E. Gromachevskaya, T. Kosulina, V. Kul'nevich, Yu. Samitov, A. Khayarov, V. Dubonosov] The formation of 2,4-substituted 1,2-dihydro-4H-3, 1-benzoxazines from tertiary o-aminophenylcarbinols and carbonyl derivatives has been demonstrated by means of PMR and mass spectrometry. Interconversion of the six-membered heterocycle of the half-chair ⇄ half-chair type has been established on the basis of the PMR data when identical substituents are present in positions 2 and 4. The cisarrangement of the protons in the H-C(2)-N-H fragment of the heterocycle has been determined. The general laws governing the initial fragmentation of 1,2-dihydro-4H-3, 1-benzoxazines under the effects of electron impact have been revealed. Plenum Publishing Corporation, 1990 Gromachevskaya E. Krasnodar Polytechnical Institute, 350670, Krasnodar aut Kosulina T. Krasnodar Polytechnical Institute, 350670, Krasnodar aut Kul'nevich V. Krasnodar Polytechnical Institute, 350670, Krasnodar aut Samitov Yu Krasnodar Polytechnical Institute, 350670, Krasnodar aut Khayarov A. Krasnodar Polytechnical Institute, 350670, Krasnodar aut Dubonosov V. Krasnodar Polytechnical Institute, 350670, Krasnodar aut Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/1(1990-01-01), 86-92 0009-3122 26:1<86 1990 26 10593 https://doi.org/10.1007/BF00506856 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00506856 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gromachevskaya E. Krasnodar Polytechnical Institute, 350670, Krasnodar aut NATIONALLICENCE 700 1- Kosulina T. Krasnodar Polytechnical Institute, 350670, Krasnodar aut NATIONALLICENCE 700 1- Kul'nevich V. Krasnodar Polytechnical Institute, 350670, Krasnodar aut NATIONALLICENCE 700 1- Samitov Yu Krasnodar Polytechnical Institute, 350670, Krasnodar aut NATIONALLICENCE 700 1- Khayarov A. Krasnodar Polytechnical Institute, 350670, Krasnodar aut NATIONALLICENCE 700 1- Dubonosov V. Krasnodar Polytechnical Institute, 350670, Krasnodar aut NATIONALLICENCE 773 0- Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/1(1990-01-01), 86-92 0009-3122 26:1<86 1990 26 10593 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer