The kinetics of protonation of pseudoephedrine by 3,6-di-tert-butyl-2-hydroxyphenoxyl have been analyzed by the ESR technique. It was shown that protolysis of the radical produced closed ionic pairs with the pseudoephedrine cation in a dimer state.
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Masalimov, A.S., Nikol'skii, S.N., Abdykarimova, A.P. et al. ESR analysis of the kinetic alkalinity of pseudophedrine. Russ Chem Bull 41, 1559–1562 (1992). https://doi.org/10.1007/BF00863572
- ion pairs