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The 1 H, 15 N, and 13 C NMR spectra of partially 15 N labeled bis-(2-pyridyl)-acetonitrile (1) dissolved in CDCl 3 and CD 2 Cl 2 have been measured in order to characterize its intramolecular NHN hydrogen bond. A fast proton tautomerism renders the molecule symmetric within the NMR timescale which complicates the determination of the scalar coupling...
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