caa a22 4500 467992282 CHVBK 20180323112548.0 cr unu---uuuuu 170328e19901001xx s 000 0 eng 10.1007/BF00472188 doi (NATIONALLICENCE)springer-10.1007/BF00472188 Energetics and structural mechanisms of photochemical processes in molecules of aldonitrone vinylogs [Elektronische Daten] [A. Metelitsa, M. Knyazhanskii, N. Volbushko, V. Nedzvetskii, V. Minkin] Depending on the multiplicity of the excited state, alternative photoreactions are realized in methoxy and acetoxy derivatives of aldonitrone vinylogs: diabatic nitrone-oxazypyridone rearrangement in the first excited singlet state and E-Z isomerization involving the C=N bond in the triplet state. In the case of aldonitrone vinylogs with an o-hydroxy group in the α-aryl ring one observed adiabatic proton transfer from the hydroxy group to the azotoxido group with a subsequent diabatic reaction involving cyclization to the 2H-chromene structure. The same transfer is also realized in the triplet state. The quantum yields were determined, and the energies of activation of the photoreactions and the reverse thermal processes were evaluated. Plenum Publishing Corporation, 1991 Metelitsa A. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut Knyazhanskii M. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut Volbushko N. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut Nedzvetskii V. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut Minkin V. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/10(1990-10-01), 1145-1149 0009-3122 26:10<1145 1990 26 10593 https://doi.org/10.1007/BF00472188 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00472188 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Metelitsa A. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut NATIONALLICENCE 700 1- Knyazhanskii M. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut NATIONALLICENCE 700 1- Volbushko N. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut NATIONALLICENCE 700 1- Nedzvetskii V. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut NATIONALLICENCE 700 1- Minkin V. Scientific-Research Institute of Physical and Organic Chemistry, Rostov State University, 344104, Rostov-on-Don aut NATIONALLICENCE 773 0- Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/10(1990-10-01), 1145-1149 0009-3122 26:10<1145 1990 26 10593 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer