caa a22 4500 467992592 CHVBK 20180323112548.0 cr unu---uuuuu 170328e19900401xx s 000 0 eng 10.1007/BF00497225 doi (NATIONALLICENCE)springer-10.1007/BF00497225 Investigation of azoles and azines. 75. Structure of 2-aryl-1,3-oxazine-4,6-diones in the gas phase [Elektronische Daten] [V. Zakhs, I. Viktorovskii, B. Ivin] The mass-spectrometric fragmentation of a number of potentially tautomeric 2-aryl-1,3-oxazine-4,6-diones and model substances that fix the possible tautomeric forms was studied. The characteristic fragmentation pathways that are peculiar to one or another tautomer and the characteristic ions that make it possible to identify them in tautomeric mixtures were ascertained. It is shown that in the gas phase 2-aryl-1,3-oxazine-4,6-diones exist in mixtures of 4-hydroxy, 6-oxo, dipolar-ionic, and dicarbonyl forms; the amounts of the latter two forms increase with intensification of the electron-acceptor properties of the substituent in the para position of the benzene ring. Plenum Publishing Corporation, 1990 Zakhs V. Leningrad Institute of Pharmaceutical Chemistry, 197022, Leningrad aut Viktorovskii I. Leningrad Institute of Pharmaceutical Chemistry, 197022, Leningrad aut Ivin B. Leningrad Institute of Pharmaceutical Chemistry, 197022, Leningrad aut Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/4(1990-04-01), 472-477 0009-3122 26:4<472 1990 26 10593 https://doi.org/10.1007/BF00497225 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00497225 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zakhs V. Leningrad Institute of Pharmaceutical Chemistry, 197022, Leningrad aut NATIONALLICENCE 700 1- Viktorovskii I. Leningrad Institute of Pharmaceutical Chemistry, 197022, Leningrad aut NATIONALLICENCE 700 1- Ivin B. Leningrad Institute of Pharmaceutical Chemistry, 197022, Leningrad aut NATIONALLICENCE 773 0- Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/4(1990-04-01), 472-477 0009-3122 26:4<472 1990 26 10593 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer