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Several groups have described a thermal shift in the equilibrium of atropisomers at high temperatures. See for example: a) N. Nishino, K. Kobata, H. Mihara, T. Fujimoto, Chem. Lett. 1992, 1991; b) E. Rose, M. Quelquejeu, C. Pochet, N. Julien, A. Kossanyi, L. J. Hamon. Org. Chem. 1993, 58, 5030; c) J. Setsune, M. Hashimoto, J. Chem. Soc. Chem. Commun. 1994, 657; d) E. Rose, A. Cardon-Pilotaz, M. Quelquejeu, N. Bernard, A. Kossanyi, B. Desmazières, J. Org. Chem. 1995, 60, 3919.
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note
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[6] However, ethanol can act as a competitive inhibitor in the formation of hydrogen-bonded complexes. In this paper, we used chloroform containing 2-methyl-2-butene as a stabilizer to obtain the thermodynamic parameters.
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42
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3543009936
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The downfield shift of the OH protons shown in Figure 4-IIb depends on the degree of hydrogen bonding of the OH groups
-
The downfield shift of the OH protons shown in Figure 4-IIb depends on the degree of hydrogen bonding of the OH groups.
-
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43
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3543025461
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note
-
αααβ-Q])- re-spectively, since the exchange process between the free and complexed host molecule is fast on the NMR time scale.
-
-
-
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45
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-
3543008045
-
-
note
-
αααβ-Q without intermediate dissociation to porphyrin and quinone is assumed in this system, the simulated curves for the relative amounts of each atropisomer cannot be reconciled with the kinetic data shown in Figure 8 and 11.
-
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46
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0002643550
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51
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3542991805
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α carbons of the four pyrrole rings were not detected, owing to the broadening derived from N-H tautomerism
-
α carbons of the four pyrrole rings were not detected, owing to the broadening derived from N-H tautomerism.
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-
-
-
52
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3543020025
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Several singlet peaks appear at the same position for each phenyl and pyrrole carbon, owing to the presence of a mixture of four atropisomers
-
Several singlet peaks appear at the same position for each phenyl and pyrrole carbon, owing to the presence of a mixture of four atropisomers.
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