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34247599312
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1a: melting point 320-321 °C (lit. 319-320 °C, 13, 1H-NMR (CDCl3) δ: 2.18 (s, 9H, Mex3, 6.22 (s, 1H, CH, 7.15 (ddd, 3H, Ar-Hx3, J, 1.5, 7.0, 7.5 Hz, 7.18 (ddd. 3H, Ar-Hx6, J, 1.5, 7.0, 7.5 Hz, 7.25 (dd, 3H, Ar-Hx3, J, 1.5, 7.0 Hz, 7.58 (dd, 3H, Ar-Hx6, J, 1.5, 7.5 Hz, 7.70 (bs, 3H, NHx3, 13C-NMR (CDCl3) δ: 8.4, 33.6, 108.9, 111.1, 118.6, 119.7, 122.0, 129.5, 131.5, 135.3. IR (in CHCl3, concentration, 10 mM, 3442 cm-1. FAB-MS: 404 (M+H, Elemental Analysis: Calcd. for C28 H25 N3, C: 83.34, H: 6.24, N: 10.41, Found: C: 83.54, H: 6.04, N: 10.22, 1b: melting point 230 °C (decomposed, 1H-NMR (CDCl3) δ: 2.17 (s, 6H, Mex2, 4.88 (bs, 1H, OH, 6.10 (a, 1H, CH, 6.87 (dd, 1H, Ar-H, J= 1.5, 7.5 Hz, 6.93 (ddd, 1H, Ar-H, J, 1.5, 7.5, 7.5 Hz, 7.05 dd, 1H, Ar-H
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2, C: 85.68 %; H: 6.33 %; N: 7.99%. Found: C: 85.88 %; H: 6.42 %; N: 7.75 %.
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34247604951
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In competitive solvents, such as water and DMSO, the chemical shifts of solvent-exposed amide NH protons exhibit large temperature dependencies, while intramolecularly hydrogen-bonded amide NH protons, namely solvent-shielded protons, exhibit small temperature dependencies
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In competitive solvents, such as water and DMSO, the chemical shifts of solvent-exposed amide NH protons exhibit large temperature dependencies, while intramolecularly hydrogen-bonded amide NH protons, namely solvent-shielded protons, exhibit small temperature dependencies.
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Ito, K.1
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34247554862
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-1 increased. The IR spectral change was ascribed to hydrogen bonding between NH protons and anion component of 2.
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-1 increased. The IR spectral change was ascribed to hydrogen bonding between NH protons and anion component of 2.
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31
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34247602038
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1H NMR chemical shift change (Δδ) of the NH proton of 1 that is sensitive to complex formation. The data were plotted in the form Δδx [1] versus [1]/[1] + [2]), and the position of the maximum indicates the stoichiometry of the complex.
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1H NMR chemical shift change (Δδ) of the NH proton of 1 that is sensitive to complex formation. The data were plotted in the form Δδx [1] versus [1]/[1] + [2]), and the position of the maximum indicates the stoichiometry of the complex.
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Hirose, K. J. Inc. Phenom. Macrocycl. Chem, 2001, 122, 193. Stability constants (Ks) were obtained by 1H-NMR titration experiments, performed directly in the NMR tube using a micropipette to add known amounts (0, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500 μl) of quaternary ammonium salt (2) stock solution (concentration, 10.0 mM) in CDCl3 to a solution of indolylmethanes (1, 700 μl, concentration, 5.76 mM) in CDCl3. A 1:1 association of indolylmethanes (1) and quaternary ammonium salts (2) was previously demonstrated by Job plots, therefore, experimental data were fit to the equation of the 1:1 binding isotherm. All titration experiments were performed in CDCl3 at 297 K and 500 MHz
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3 at 297 K and 500 MHz.
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CS Chem3D Pro(R) version 3.5.2 for windows, Cambridge Soft, Massachusetts, 1997
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CS Chem3D Pro(R) version 3.5.2 for windows, Cambridge Soft, Massachusetts, 1997.
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