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2 protons of the butyl chain shifted upfield from δ 3.13 to 2.86. However, the signal downfield shifted to δ 2.89 when the concentration increased up to 21 mM. Such concentration dependence precluded the calculation of the association constants on the assumption that monomer-dimer equilibrium is dominant in this concentration range.
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For the anisotropic deshielding effect of carbonyl group, see ref 12, p 88. Such large chemical shift difference of vicinal protons adjacent to an amide nitrogen is also seen in the spectra of cyclic compounds
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For calculation of the ΔG‡ value, we did not take into account the participation of monomer la in the equilibrium between 24 and 24′, because even at 90 °C the monomer-dimer equilibrium shifted almost exclusively to the dimer at this concentration. The apparent upfield shift of the chemical shift of the NH protons with increasing temperatures is ascribed to the distortion of the hydrogen bond rather than dissociation of 24. See, for the temperature effects on the chemical shift of hydrogen-bonded protons: Adrian, J. C., Jr.; Wilcox, C. S. J. Am. Chem. Soc. 1991, 113, 678-680.
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