Acetylene photoadds to benzene giving cyclooctatetraene; the corresponding addition of dimethyl acetylenedicarboxylate occurs via intermediate (I), and the addition of methyl phenylpropiolate involves photoexcitation of the acetylene rather than the benzene.
D. Bryce-Smith, A. Gilbert and J. Grzonka, J. Chem. Soc. D, 1970, 498 DOI: 10.1039/C29700000498
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