Proton, carbon-13, and nitrogen-15 nuclear magnetic resonance studies of [15N]azoles: 1-phenylpyrazole and the tautomerically mobile 3-methyl-1-phenylpyrazolin-5-one
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 8,p. 1024-1027
- https://doi.org/10.1039/p29770001024
Abstract
The 1H, 13C, and 15N chemical shifts and 1H–13C, 1H–15N, 13C–15N, and 15N–16N coupling constants of 95%15N-enriched 1-phenylpyrazole and 1-phenyl-3-methylpyrazolin-5-one have been determined and assigned. In the case of 3-methyl-1-phenyl [15N2]pyrazolin-5-one only the 15N n.m.r. spectrum [solvent (CD3)2SO] shows that slow exchange occurs between the NH and OH tautomers.Keywords
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