On irradiation in ;icctoniirile solution. 2.4-dioxoieirahydropyridincs I , the key compounds of conjugated nitrogen -carbony1 sgstcms, undergo photodimcriiation to a h d thc rmris-syn diincrs 2 as major products. Irradiation of N-mcthylenc-linked hisl~.l-dio~oteirahydrclpyridines) 3 led to rapid photoreaction to givs 4.
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