Macrocycles built of carbazole and pyridine fragments with alkene/alkane linkers constitute a helical structure as documented structurally and spectroscopically. The ‘solid-state’ prearrangement observed for two C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
C bonds leads to unprecedented transformation to a cyclobutane in a head-to-tail (rtct) geometry with two macrocyclic loops in a perpendicular orientation.
J. Klajn, W. Stawski, P. J. Chmielewski, J. Cybińska and M. Pawlicki, Chem. Commun., 2019, 55, 4558 DOI: 10.1039/C9CC01201J
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