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UV light irradiation of 2-cyclohexenones (1) in the presence of saponite clay resulted in a regioselective photodimerization affording anti-head-to-head dimer. The directed intercalation of 1 was suggested by the regioselective dimerization, X-ray diffraction, IR and photoluminesence analyses.
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Usami et al. (1992) studied this question.
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