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Photoirradiation of vinylcyclopropenes in a Pyrex tube provides 1-isopropylidene-3,8a-diphenyl-1,8a-dihydroazulene derivatives in moderate to good yields within 4.5-14 h. A plausible mechanism has been discussed for the formation of these interesting products.
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Yu et al. (2009) studied this question.
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