Abstract
The irradiation of the natural phthalide Z-ligustilide ( 1 ) gave the natural dimeric phthalide riligustilide ( 5 ), and three novel dimeric phthalides 7 , 8 and 9 . The chemo- and regio-selectivity involved in the formation of the photocyclodimers were analyzed by use of frontier molecular orbital methods and the preference in the formation of 7 was supported by the theoretical analysis.
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