title: Derivatives of pyrazinecarboxylic acid: 1H, 13C and 15N NMR spectroscopic investigations.
abstract: NMR spectroscopic studies are undertaken with derivatives of 2-pyrazinecarboxylic acid. Complete and unambiguous assignment of chemical shifts ((1)H, (13)C, (15)N) and coupling constants ((1)H,(1)H; (13)C,(1)H; (15)N,(1)H) is achieved by combined application of various 1D and 2D NMR spectroscopic techniques. Unequivocal mapping of (13)C,(1)H spin coupling constants is accomplished by 2D (delta,J) long-range INEPT spectra with selective excitation. Phenomena such as the tautomerism of 3-hydroxy-2-pyrazinecarboxylic acid are discussed.
authors.affiliation: Department of Drug and Natural Product Synthesis, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria. wolfgang.holzer@univie.ac.at
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Holzer
authors.forename: Gernot A
authors.initials: GA
authors.lastname: Eller
authors.forename: Barbara
authors.initials: B
authors.lastname: Datterl
authors.forename: Daniela
authors.initials: D
authors.lastname: Habicht
mesh_terms: D002247:Carbon Isotopes; D006859:Hydrogen; D009682:Magnetic Resonance Spectroscopy; D009587:Nitrogen Isotopes; D011718:Pyrazinamide / Q000031:analogs & derivatives* / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D011718:Pyrazinamide; C005296:pyrazinoic acid; D006859:Hydrogen