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High resolution NMR spectroscopy of heteroaromatic cations. II—pyrylium, thiapyrylium and seleninium cations

✍ Scribed by P. Sándor; L. Radics

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
892 KB
Volume
16
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

High resolution ^1^H, proton coupled ^13^C and broad‐band decoupled ^13^C{^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 coupling constants, as well as the magnitudes of all one‐ and three‐bond ^13^C,^13^C couplings observable in naturally occurring doubly‐labelled isotopomers. For the seleninium cation, the magnitudes and relative signs of all ^77^Se,^1^H and ^77^Se,^13^C coupling constants were also obtained. The chemical shifts and coupling data are compared, on a qualitative basis, with existing theoretical predictions.

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