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Abstract A heteroaromatic compound 3,6-diaminodipyrido3,2-a: 2′,3′-cphenazine was synthesized with an improved method to convert 1,10-phenanthroline derivatives to the corresponding 5,6-diones. It was shown that the electron-donating effects of amino substituents were extended not only to pyridine rings but also to the phenazine ring.
Yamada et al. (Wed,) studied this question.
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