Abstract
Abstract The photolysis of spiro[benzo[b]thiophene-2(3H),1′-cyclopropan]-3-one 1,1-dioxide (1) in benzene afforded 2-biphenylyl cyclopropyl ketone with extrusion of sulfur dioxide, whereas the irradiation of 1 in toluene or p-xylene formed photoreduced dimer and bibenzyl or 4,4′-dimethylbibenzyl, respectively. The photolysis of spiro[benzo[b]thiophene-2(3H),1′-cyclopropan]-3-one in benzene afforded the valence isomer 2,3-dihydro[1]benzothieno[3,2-b]furan.
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