NMR Study of Nuclear Spin Polarization During Chemical Reactions with Ortho Hydrogen
Polarization signals in NMR spectra do not necessarily point to reactions via radicals. This is confirmed by hydrogenations (a) with enriched ortho and para hydrogen, in which polarization signals were observed in each case, albeit with different intensity and reversed sequence of emission and absorption. the intensity ratio can be correlated with the ratio of the ortho and para hydrogen, and thus it is unequivocally confirmed that the nuclear spin states of the H2 molecules are responsible for the non-equilibrium occupation of the product nuclear spin level.
J. Bargon et al., "NMR Study of Nuclear Spin Polarization During Chemical Reactions with Ortho Hydrogen," Angewandte Chemie - International Edition in English, vol. 29, no. 1, pp. 58-59, Wiley-VCH Verlag, Jan 1990.
The definitive version is available at https://doi.org/10.1002/anie.199000581
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