NOTESvul. 26 soluble inorganic material by gravity filtration, was added 0.4 g. (0.0038 mole) of o-phenylenediamine in 20 ml. of ethyl acetate. The pink solution was heated on the steam bath for 30 min., cooled, and on evaporation to dryness under an air stream left an amber residue which recrystallized from benzene as red microcrystalline 1-aminophenazine, 0.41 g. (67.7%) m.p. 183-1840.1 This and other phenazines prepared in a similar manner are described in Table I. Lead dioxide could be substituted for silver oxide in each example.
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