2,3,7,8-Tetrakis(trimethylsilyl)benzo[3,4]cyclobuta[1,2-b]biphenylene undergoes photochemical oxidative cleavage to give diketones (2), (3), and (4), two of which [(2) and (4)] contain an alkyne unit derived from the original central benzene ring.
H. Mestdagh and K. P. C. Vollhardt, J. Chem. Soc., Chem. Commun., 1986, 281 DOI: 10.1039/C39860000281
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