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Synthesis of I-benzyloxy-2(1H)-pyrazinones having suhstituents at C-5 and C-6 positions and their photochemical behavior have been studied.Upon Irradiation 1-benzyloxy-2(lH)pyrazinones underwent N-0 bond cleavage in high quantum yields.The rearrangement of the benzyloxy group to C-3 position of the ring and [2+2] cycloaddition were also observed.Recently;we have investigated syntheses and reactions of N-hydroxyamide-containing diazine derivatives