The reaction of o‐aminophenol and p‐benzoquinone in acetic acid yields phenoxazinones 1, 5 and 6, phenoxazine 7, triphenodioxazine 2, ditriphenodioxazine 3 and the phenoxazinonyltriphenodioxazine 4.
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Bolognese et al. (1986) studied this question.
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