The preference of N,N-aryl, alkyl tertiary amides for cis conformations has been exploited through the use of tertiary squaramides as hairpin turn units that promote the folding of aromatic β-sheets. Head-to-head aromatic arrangements were shown to prevail in sufficiently long bent aromatic sequences.
J. Atcher, A. Nagai, P. Mayer, V. Maurizot, A. Tanatani and I. Huc, Chem. Commun., 2019, 55, 10392 DOI: 10.1039/C9CC04849A
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