Journal
ORGANIC LETTERS
Volume 10, Issue 22, Pages 5127-5130Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol801980h
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- Faculty of Science and Office of Life Sciences at National University of Singapore
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Introduction of a continuous hydrogen-bonding network suppressed the conformational flexibility of an oligomeric backbone. Cyclization of a rigidified, suitably sized oligomer led to a circular aromatic pentamer. Its crystal structure determined by X-ray crystallography reveals a pseudo five-fold symmetric planarity in the solid state, which is quite unusual among all the previously described shape-persistent macrocycles and synthetic foldamers with biased conformations enforced by noncovalent forces.
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