Palladium mediated ethynylation of iodoarenes coupled with cobalt catalysed alkyne cotrimerisations allows rapid access to benzo[3,4]cyclobuta[1,2-b]biphenylene, a linear biphenylenoid, and two of its trimethylsilyl derivatives.
B. C. Berris, G. H. Hovakeemian and K. P. C. Vollhardt, J. Chem. Soc., Chem. Commun., 1983, 502 DOI: 10.1039/C39830000502
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