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Irradiation of a benzene solution of 2-alkoxy-3-cyanopyridines in the presence of 2-cyanofuran gave 4+4 photoadducts in good yields, and the structure was established by X-ray single crystal analysis.
Irradiation of a benzene solution containing 2-alkoxynicotinic acid esters (0.02 M) and furan (0.2 M) resulted in the formation of cage-type adducts in 73–84% yield. The structure of the adducts was established by X-ray crystallographic analysis. The mechanism involving 4π+4π photocycloaddition between the pyridine ring and furan was postulated. Two diastereomeric 4π+4π adducts were detected as intermediates...
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