13C NMR 2 1H NMR 2 Journal Article 2 Research Support, Non-U.S. Gov't 2 tautomeric behavior 1-phenyl-2-(phenyldiazenyl)butane-1,3-dione 1 4-hydroxy-3-(phenyldiazenyl)-2H-chromen-2-one 1 mehr ... 5-aryloxy tetrazole 1 Carbon Isotopes 1 Deuterium Oxide 1 Dimethyl Sulfoxide 1 J65BV539M3 1 NMR 1 Protons 1 Tetrazoles 1 YOW8V9698H 1 isotope effect 1 isotopomer 1 rotational barrier 1 solvent-substrate proton exchange 1 β-isotope effect 1 weniger ...