Oxazines

Oxazines are heterocyclic containing one oxygen and one nitrogen atom in a cyclohexa-1,4-diene ring (a doubly unsaturated six-membered ring). exist depending on the relative position of the and relative position of the .

By extension, the derivatives are also referred to as oxazines; examples include ifosfamide and morpholine (tetrahydro-1,4-oxazine). A commercially available dihydro-1,3-oxazine is a reagent in the Meyers synthesis of aldehydes. Fluorescent dyes such as Nile red and Nile blue are based on the aromatic compound benzophenoxazine. Cinnabarine and cinnabaric acid are two naturally occurring dioxazines, being derived from biodegradation of tryptophan.

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Dioxazines Dioxazines are pentacyclic compounds consisting of two oxazine subunits. A commercially important example is the pigment pigment violet 23.

(2025). 9783527302048, John Wiley & Sons. ISBN 9783527302048

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Benzoxazines are bicyclic compounds formed by the ring fusion of a benzene ring with an oxazine. 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.

(2025). 9780444537904, Elsevier B.V.. ISBN 9780444537904

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Physical properties Oxazine dyes exhibit solvatochromism.

== Images ==

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External links

• Development of polymeric materials as a class of benzoxazines

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