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Abstract
Tug of war: Treatment of the doubly 15N-labeled anion receptor 6-nitro-2,3-dipyrrol-2-ylquinoxaline with solid sodium hydride in CD2Cl2/[D6]DMSO leads to the monodeprotonated anion (see picture). The NMR data indicate the formation of a very strong intramolecular NHN hydrogen bond, with a scalar 15N–15N coupling constant of 16.5 Hz, the largest value observed to date. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z704411_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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