The hitherto longest molecular ribbons (4–6), composed of several [3.3]metacyclophane units, are synthesized using a new iterative synthetic strategy, up to a length of seven fourfold-bridged benzene rings, and it is proved by X-ray crystal structural analyses and 1H NMR spectroscopy that these molecules form meander-type folded syn conformations leading to multiple π-staples.
S. Breidenbach, S. Ohren, M. Nieger and F. Vögtle, J. Chem. Soc., Chem. Commun., 1995, 1237 DOI: 10.1039/C39950001237
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