Phenoxazines

Add time:07/25/2019    Source:sciencedirect.com

Publisher SummaryThis chapter describes the recent advances in the chemistry of phenoxazine. From the different suggested numberings of the phenoxazine nucleus, at present only two systems are widely used. Throughout this chapter the numbering system has been adopted as being the most frequent today. The phenoxazines are crystalline, colorless to yellow solids; the nitrophenoxazines being colored in different shades of red. The usual synthesis of phenoxazines makes use of suitable ortho-disubstituted benzenes, starting from which the oxazine skeleton is completed by ring closure. The heterocyclic oxygen atom of the phenoxazine nucleus places certain restrictions on the aromaticity of the ring system that appears to be somewhat less aromatic than the phenazine system, for instance. The atomic models show that the phenoxazine nucleus is slightly folded along its short axis.

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