caa a22 4500 467991375 CHVBK 20180323112545.0 cr unu---uuuuu 170328e19900701xx s 000 0 eng 10.1007/BF00509701 doi (NATIONALLICENCE)springer-10.1007/BF00509701 Pyrylocyanins. 26. Symmetrical di-tert-butyldiphenyl-substituted pyrylo-2-cyanins [Elektronische Daten] [M. Kudinova, V. Kurdyukov, A. Ishchenko, A. Tolmachev] Isomeric 2-methyl-4-phenyl-6-tert-butylpyrylium and 2-methyl-4-tert-butyl-6-phenylpyrylium salts and their sulfur analogs were synthesized. From these, symmetrical α-pyrylium and α-thiopyrylium carbo- and dicarbocyanins were obtained. α-Pyrylocyanins were converted into symmetrical α-pyridocyanins. From a comparison of the experimental spectral characteristics of the above dyes with the results of quantum-chemical calculations of the average positions of the absorption bands and the quadratic changes of the bond orders during excitation, the influence of the phenyl substituent in the 2- and 4-positions of the heteroresidue on the color was analyzed. Plenum Publishing Corporation, 1991 Kudinova M. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, 252660, Kiev aut Kurdyukov V. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, 252660, Kiev aut Ishchenko A. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, 252660, Kiev aut Tolmachev A. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, 252660, Kiev aut Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/7(1990-07-01), 750-756 0009-3122 26:7<750 1990 26 10593 https://doi.org/10.1007/BF00509701 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00509701 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kudinova M. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, 252660, Kiev aut NATIONALLICENCE 700 1- Kurdyukov V. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, 252660, Kiev aut NATIONALLICENCE 700 1- Ishchenko A. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, 252660, Kiev aut NATIONALLICENCE 700 1- Tolmachev A. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, 252660, Kiev aut NATIONALLICENCE 773 0- Chemistry of Heterocyclic Compounds Kluwer Academic Publishers-Plenum Publishers 26/7(1990-07-01), 750-756 0009-3122 26:7<750 1990 26 10593 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer