An unusually substantial coupling is observed across the hydrogen bond of fully N-labeled compound 1 when it is studied by H and N NMR spectroscopy. The structure was determined by X-ray diffraction and shown to correspond to tautomer 1 a (both in the solid state and in solution). These results open up a new field of hydrogen-bond research by NMR spectroscopic methods.
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| http://dx.doi.org/10.1002/1521-3773(20010119)40:2<420::AID-ANIE420>3.0.CO;2-I | DOI Listing |
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