Dimethyl 9,10-cyclopropano-9,10-dihydroanthracene-11,12-dicarboxylate (1b) has been prepared and found to rearrange photochemically by direct or sensitized irradiation with participation of the cyclopropyl ring to the isomers (4a) and (5a).
H. Hemetsberger and W. Holstein, J. Chem. Soc., Chem. Commun., 1977, 93 DOI: 10.1039/C39770000093
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