Abstract

Photo-induced addition reaction of norbornene and dimethyl maleate afforded exo-3,4-dicarbomethoxy- cis, rans, cis-tricyclo[4,2,1,0 2,5]nonane (I) exclusively. In a similar way, the photochemical reaction of dimethyl acetylene dicarboxylate and norbornene gave rise to the 1:1 photo-adduct having the similar configuration, exo-3,4-dicarbomethoxy-tricyclo[4,2,1,0 2,5]nona-3-ene. Moreover, it was confirmed that the above reactions did not proceed through the charge-transfer complex.

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