Study of oxidation reactions of 4H-selenopyrans

A novel reaction of 2,4,6-triphenyl(thio)selenopyrylium salts leading to benzoyl(thio)selenophenes and 2,4,6-triphenyl(thio)selenopyrans

“…data 12 : m.p. 49.5-51.0 °С), yield by GC MS 42% (together with supposed 2,6 diphenyl 2Н selenopyran (11), which was not de scribed in literature; the peak of putative compound 11 was not completely separated from the peak of compound 10 in GC). The chromatographical yield of 2 benzoyl 5 phenylselenophene (9) was 8%, and that of 2,6 diphenylselenopyran 4 one (8) was 31%.…”

Polycyclic aromatic hydrocarbons containing antiaromatic chalcogenopyrano[3,2-b]-chalcogenopyrans

“…In contrast, 7 π-electrons are involved in both thiopyran and selenopyran. Consequently, chalcogenopyrans often occur as onium salts (thiopyrylium salts 15 and selenopyrylium salts 16,17 ) and ketones (thiopyran-4-one 18,19 and selenopyran-4-one 17,20 ). Moreover, bicyclic chalcogenopyrano [3,2-b]chalcogenopyrans (Fig.…”