Лако-красочные материалы — производство

Anthraquinone dyes are prepared by the stepwise introduction of substituents onto the preformed anthraquinone skeleton (1) or ring closure of appropriately substituted precursors. The degree of freedom for producing a variety of different structures is restricted, and the availability of only eight substitution centers imposes a further restriction on synthetic flexibility. Therefore, there is signifi­cantly less synthetic versatility than in the case of azo dyes, and consequently less variety; this is a drawback of anthraquinone dyes.

Although tautomerism is theoretically possible in amino and hydroxy anthra­quinone dyes, none has been observed. Studies by 13C NMR spectroscopy have shown convincingly that amino and hydroxy dyes of 9,10-anthraquinone exist as such.