Internal cyclotrimerisation of aromatic triynes on a Ziegler catalyst has given a series of compounds containing two aromatic rings joined by three polymethylene chains. Melting point alternation and spectral properties are similar to those of paracyclophanes.
A. J. Hubert, J. Chem. Soc. C, 1967, 6 DOI: 10.1039/J39670000006
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