Hydrogen-bonding interactions drive oligosquaramides of different lengths to fold into hairpin-like structures both in nonprotic and protic solvents. These compounds are useful preorganized precursors in macrocyclization reactions.
C. Rotger, M. N. Piña, M. Vega, P. Ballester, P. M. Deyà, A. Costa
Angew. Chem. Int. Ed. 2006, 45, 6844-6848
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