27 августа, 2015 
Pokraskin The general synthesis of the most important dyes within this group, e. g. the cyanine dyes, is described in Section 5.7.
2.5.2 Principal Properties and Classification
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A cyanine containing three carbon atoms between the heterocyclic rings is called a carbocyanine (3, n = 1). Replacing these carbon atoms by one, two, and three nitrogen atoms produces aza-, diaza-, and triazacarbocyanines. Dyes of these three classes are important yellow dyes for polyacrylonitrile, e. g., C. I. Basic Yellow 28 , 48054 [54060-92-3 ] (4)
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