I. Goljer, V. Milata, D. Ilavský
Feb 1, 1989
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Journal
Magnetic Resonance in Chemistry
Abstract
Benzimidazole‐ and benzotriazole‐amino derivatives of prop‐2‐enoic acid were studied by 1H NMR spectroscopy in the liquid state and by 13C NMR spectroscopy in the liquid and solid states. The spectra shows tautomerism of the benzimidazole and benzotriazole rings, E‐Z isomerism of the double bond of the propenoic acid substituent and the conformation around the amino NHCH bond. The formation of an intramolecular hydrogen bond between the amino proton and the COOR group of propenoic acid is discussed. The structures of the derivatives are presented on the basis of the 13C CP‐MAS NMR spectra in the solid state.