Abstract
The dipole moments and ultraviolet spectra were measured for selenium compounds containing SeOCF3 and SeO2CF3 groups. It is shown that in the ground state the SeO2CF3 group has a greater tendency toward conjugation with the π-electron system of the benzene ring thandoes the SeOCF3 group. In the ground state, selenium compounds containing SeOCF3 and SeO2CF3 groups have a smaller conjugation effect than corresponding sulfur compounds. Oxidation of SeCF3 to SeOCF3 decreases the degree to which the uncollectivized electrons of selenium take part in conjugation with electron-accepting groups. In the unexcited state the free electrons of selenium in SeCH3 and SeCF3 groups are more mobile than those of sulfur in SCH3 and SCF3 groups, and the π* level of the Se=O groups is lower than that of the S=O group.
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Lutskii, A.E., Obukhova, E.M., Granzhan, V.A. et al. Reaction of SeOCF3 and SeO2CF3 groups with π-electron systems in ground and excited states. Theor Exp Chem 5, 409–412 (1972). https://doi.org/10.1007/BF00524569
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DOI: https://doi.org/10.1007/BF00524569