Photooxygenation of triphenyl pyrylium a
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Zen-ichi Yoshida; Toyonari Sugimoto; Shigeo Yoneda
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Article
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1971
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Elsevier Science
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French
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The formal replacements of a -CH= group of benzene by -A= and -"s= groups give 6,, non-benzenoid aromatic systems, pyrylium and thiopyrylium cations, respectively. Both the cations are supposed to be resonance hybrids of Kekulg-type structures (A) and carbonium ion structures (B) in the ground stat