Charge-transfer excitation of complexes of anhydrides with indene or 1,1-dimethylindene in polar solvents leads to cyclobutadimerization via radical cations; the same products are formed using pyrylium salts as photosensitizers, as well as from the thermal oxidation; with ferric chloride; these reactions are quenchable with efficient electron donors.
S. Farid and S. E. Shealer, J. Chem. Soc., Chem. Commun., 1973, 677 DOI: 10.1039/C39730000677
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