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Hydrogenation of the readily prepared dinitrobenzenediamines 7 followed by air oxidation affords the green colored 5,7-disubstituted-5H,12H-quinoxalino[2,3-b]phenazines 3 in good yields.Mechanistic rationale, compound characterisation and full experimental details are provided.
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Panayiotis A. Koutentis (2002) studied this question.
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