Abstract

Re-examination of the thermal and photochemical decomposition of 2-azidophenazine reveals new pathways. Thus, besides reduction to the amine, the triplet nitrene yields the azo derivative and phenazino[1',2':5,6]pyridazino[4,3-a]phenazine while the singlet nitrene rearranges to the dehydroazepine and adds a further molecule of azide to yield an open-chain imine. The factors leading to the predominance of «dimeric» products from this type of heterocyclic azides are discussed

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