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Oxazines

Oxazines are heterocyclic organic compounds containing one oxygen and one nitrogen atom in a cyclohexa-1,4-diene ring. Isomers exist depending on the relative position of the heteroatoms and relative position of the double bonds.

Dioxazines
Dioxazines are pentacyclic compounds consisting of two oxazine subunits. A commercially important example is the pigment pigment violet 23. ==Benzoxazines==
Benzoxazines
Benzoxazines are bicyclic compounds formed by the ring fusion of a benzene ring with an oxazine. Polybenzoxazines are a class of polymers formed by the reaction of phenols, formaldehyde, and primary amines which on heating to ~200 °C (~400 °F) polymerise to produce polybenzoxazine networks. The resulting high molecular weight thermoset polymer matrix composites are used where enhanced mechanical performance, flame and fire resistance compared to epoxy and phenolic resins is required. == Physical properties ==
Physical properties
Oxazine dyes exhibit solvatochromism. == Images ==
Images
File:Structural formula of morpholine.svg|Morpholine File:10H-phenoxazine 200.svg|Phenoxazine File:C.I. Pigment Violet 23.svg|Pigment violet 23 is a commercially useful pigment. == References ==
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