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Azo dyes encompass the largest family of dyes:
They contain an azo group, -N=N-, linking two aromatic rings
To be useful as dyes, azo compounds must be soluble in water, which is achieved by having polar and ionic groups attached to the aromatic rings
Synthesis of azo dyes
the diazonium salt is coupled to an aromatic compound, usually a phenol or an aniline derivative, to yield an azo dye.
Common coupling agents for permanent hair dyes!
Choose which aromatic compound to couple to the diazonium salt synthesized in Part A:
OR
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