caa a22 4500 467991146 CHVBK 20180323112545.0 cr unu---uuuuu 170328e19900901xx s 000 0 eng 10.1007/BF00472489 doi (NATIONALLICENCE)springer-10.1007/BF00472489 Cycloaddition of anhydro bases of heterocyclic cations [Elektronische Daten] 1. Synthesis of spirohetarenes in the reaction of s-tetrazines with the anhydro bases of acridinium, xanthylium, and thioxanthylium salts [E. Kovalev, G. Rusinov, V. Anufriev, L. Egorova] A new method of spiro-ring formation by the reaction of s-tetrazines with anhydro bases was described. The prototropic transitions were detected in the pyridazine fragments of the resulting spirocyclic compounds. The heterocycles of the anhydro bases are converted to cyclic ketones as a result of the breaking of the spiro junction in the acidic hydrolysis of the spirohetarenes. The regioselectivity of the cycloaddition was established. Plenum Publishing Corporation, 1991 Kovalev E. S. M. Kirov Urals Polytechnical Institute, 620002, Sverdlovsk aut Rusinov G. S. M. Kirov Urals Polytechnical Institute, 620002, Sverdlovsk aut Anufriev V. S. M. Kirov Urals Polytechnical Institute, 620002, Sverdlovsk aut Egorova L. S. M. Kirov Urals Polytechnical Institute, 620002, Sverdlovsk aut Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/9(1990-09-01), 1038-1043 0009-3122 26:9<1038 1990 26 10593 https://doi.org/10.1007/BF00472489 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00472489 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kovalev E. S. M. Kirov Urals Polytechnical Institute, 620002, Sverdlovsk aut NATIONALLICENCE 700 1- Rusinov G. S. M. Kirov Urals Polytechnical Institute, 620002, Sverdlovsk aut NATIONALLICENCE 700 1- Anufriev V. S. M. Kirov Urals Polytechnical Institute, 620002, Sverdlovsk aut NATIONALLICENCE 700 1- Egorova L. S. M. Kirov Urals Polytechnical Institute, 620002, Sverdlovsk aut NATIONALLICENCE 773 0- Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/9(1990-09-01), 1038-1043 0009-3122 26:9<1038 1990 26 10593 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer