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Ramalingam, V.1
Bhagirath, N.2
Muthyala, R.S.3
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57
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69549104324
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note
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The unequal vicinal coupling indicates that the macrocycle is not flipping rapidly on the NMR time-scale between conformations that exchange psuedoaxial and psuedoequatorial CH positions. A fixed macrocyclic chair conformation in 5 can be ruled out because it would exhibit four diastereotopic methylene CH signals, corresponding to two sets of inequivalent psuedoequatorial protons and two sets of inequivalent psuedoaxial protons.
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58
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69549121262
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note
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2 core has no protons to allow NMR studies, and any NMR observable group that is directly attached to the core (e.g., an anilino ring) can undergo rapid spinning about the connecting single bond.
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59
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1842555251
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Ros-Lis, J. V.; Garcia, B.; Jimenez, D.; Martinez-Manez, R.; Sancenon, F.; Soto, J.; Gonzalvo, F.; Valldecabres, M. C. J. Am. Chem. Soc. 2004, 126, 4064-4065.
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(2004)
J. Am. Chem. Soc.
, vol.126
, pp. 4064-4065
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Ros-Lis, J.V.1
Garcia, B.2
Jimenez, D.3
Martinez-Manez, R.4
Sancenon, F.5
Soto, J.6
Gonzalvo, F.7
Valldecabres, M.C.8
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