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Photooxygenation of triphenyl pyrylium and thiopyrylium cations

✍ Scribed by Zen-ichi Yoshida; Toyonari Sugimoto; Shigeo Yoneda

Publisher
Elsevier Science
Year
1971
Tongue
French
Weight
181 KB
Volume
12
Category
Article
ISSN
0040-4039

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✦ Synopsis

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 state.

πŸ“œ SIMILAR VOLUMES

High resolution NMR spectroscopy of hete
High resolution NMR spectroscopy of heteroaromatic cations. IIβ€”pyrylium, thiapyrylium and seleninium cations
✍ P. SΓ‘ndor; L. Radics πŸ“‚ Article πŸ“… 1981 πŸ› John Wiley and Sons 🌐 English βš– 892 KB

## Abstract High resolution ^1^H, proton coupled ^13^C and broad‐band decoupled ^13^Cο£Ώ{^1^H} spectra have been recorded for pyrylium, thiapyrylium and seleninium tetrafluoroborates in CD~3~CN. Analysis of these spectra has provided accurate values and relative signs of all ^1^H,^1^H and ^13^C,^1^H