The internal trimerisation of the triple bonds of linear triynes on a Ziegler catalyst gives tricyclic aromatic hydrocarbons. There is some evidence for the formation of a Dewar-like benzene as an intermediate during this “trimerisation.”
A. J. Hubert, J. Chem. Soc. C, 1967, 1984 DOI: 10.1039/J39670001984
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