Antraquinonoid Vat dyes:-
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Antraquinonoid Vat dyes:-
Anthraquinonoid vat dyes constitute a large number of subclasses. These vat dyes essentially contain groupings such as —CO—CH=CH—CO present as a quinonoid ring system or —CO(CH=CH)nCO— where n is a suitabel integral and —(CH=CH)n— part is involved either through the fused heterocyclic or through the polycyclic system. Accordingly, the main classes of vat dyes are the dyes derived from simple anthraquinone derivatives, those in which heterocyclic fused systems are involved and those in which polycyclic systems are involved. In the following discussion various typical structural features are given.
