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Acid-Induced Molecular Folding and Unfolding of N-Methyl Aromatic Amide Bearing 2,6-Disubstituted Pyridines

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posted on 21.02.2007, 00:00 by Iwao Okamoto, Mayumi Nabeta, Yasuko Hayakawa, Nobuyoshi Morita, Tetsuya Takeya, Hyuma Masu, Isao Azumaya, Osamu Tamura
The structural features and conformational conversion of the N-methyl pyridyl amide oligomer bearing 2,6-disubstituted pyridines were investigated. 1H NMR and X-ray crystallography revealed that the environment-responsive type of conformational control can be performed. The amide bond switching together with intramolecular hydrogen-bonding effects caused dynamic protonation-associated conformational conversion from layered to spiral and then flat.