Derivatives of pyrazinecarboxylic acid: 1H, 13C and 15N NMR spectroscopic investigations |
| |
| Authors: | Wolfgang Holzer Gernot A Eller Barbara Datterl Daniela Habicht |
| |
| Institution: | Department of Drug and Natural Product Synthesis, University of Vienna, Althanstrasse 14, A‐1090 Vienna, Austria |
| |
| Abstract: | NMR spectroscopic studies are undertaken with derivatives of 2‐pyrazinecarboxylic acid. Complete and unambiguous assignment of chemical shifts (1H, 13C, 15N) and coupling constants (1H,1H; 13C,1H; 15N,1H) is achieved by combined application of various 1D and 2D NMR spectroscopic techniques. Unequivocal mapping of 13C,1H spin coupling constants is accomplished by 2D (δ,J) long‐range INEPT spectra with selective excitation. Phenomena such as the tautomerism of 3‐hydroxy‐2‐pyrazinecarboxylic acid are discussed. Copyright © 2009 John Wiley & Sons, Ltd. |
| |
| Keywords: | NMR 1H NMR 13C NMR 15N NMR pyrazines |
|
|
