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15N NMR study of tetrazoles

✍ Scribed by Valentina N. Naumenko; Andrei O. Koren; Pavel N. Gaponik

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 251 KB
Volume: 30
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260300618

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✦ Synopsis

Abstract

A natural abundance ^15^N NMR study was carried out on a series of 1‐ and 2‐mono‐ and 1,5‐ and 2,5‐disubstituted tetrazoles in different media. An erroneous assignment given in the literature for 2,5‐disubstituted tetrazoles was corrected using MNDO molecular orbital calculations and the analysis of changes in the ^15^N chemical shifts on protonation. Earlier assignments for 1‐ and 2‐mono‐ and 1,5‐disubstituted tetrazoles were confirmed by the same means and by the use of ^15^N,H couplings. Direct proof that N‐4 is the protonation site is presented, to our knowledge for the first time.

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