Oxazines are heterocyclic compounds containing one oxygen and one nitrogen atom in a doubly unsaturated six-membered ring. Isomers exist depending on the relative position of the heteroatoms and relative position of the double bonds.

What is an oxazine dye?

quinone imine dyes that are derivatives of oxazine (I). The most widely used oxazine dyes are the direct ones—light and dark blue in color—and those that are used as pigments—violet in color. Direct oxazine dyes are obtained by simultaneous condensation and sulfonation processes. ...

Is the example of oxazine dyes?

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 benzophenoxazine.