Oxidation of the photo-produced enols of 2-methylbenzophenones leads to 2-formylbenzophenones, 2-benzoylbenzoic acids, 3-phenylphthalides, and anthraquinones, the latter resulting from a photo-Elbs cyclization with subsequent oxidation and requiring two activating wavelengths of incident light for production from the initial ketones.
N. D. Heindel, J. Molnar and M. Pfau, J. Chem. Soc. D, 1970, 1373 DOI: 10.1039/C29700001373
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