NMR spectroscopy of samples undergoing chemical reactions.
Note:
Customarily, this does not apply to samples where the composition of the sample, and thus its NMR spectrum, changes with time, but rather to samples at equilibrium, without any net reaction. The occurrence of chemical reactions is manifested by features of the NMR line-shape or by magnetization transfer.
Source:
PAC, 2022, 94, 353. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)' on page 407 (https://doi.org/10.1515/pac-2018-1010)