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A 15N NMR investigation of some azolopyridines

✍ Scribed by L. Stefaniak; John D. Roberts; M. Witanowski; B. T. Hamdi; G. A. Webb

Publisher: John Wiley and Sons
Year: 1984
Tongue: English
Weight: 421 KB
Volume: 22
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1270220403

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✦ Synopsis

N NMR chemical shift data are presented for 14 azolopyridines, together with the results of INDO/S-SOS calculations of nitrogen shieldings. Previous ' " N NMR results for some of these compounds are reinterpreted. The ' " N data and their assignments are shown to be reliable for the indolizine nitrogen atom from arguments based on relative line widths. The pyridine-type nitrogens are more reliably assigned from the "N spectra combined with the results of the INDo/S-SOS calculations for individual molecules. A combination of ' " N and "N NMR spectra, together with the shielding calculations, provides a basis for unambiguous assignments of all the varions nitrogen environments considered.

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