Developing Trendy And Synthetic Design Of Natural Naphthaquinone Dyestuff

There are some dyeing limitations for naphthaquinone, one type of important natural dyestuff, such as smaller molecular weight, narrower color spectrum, weaker water solubility, lower color fastness and larger original difference.Based on massive references, combining with structure features and of natural naphthaquinone, at the same time, according to the theory of dye chemistry and need of dyeing processes, this paper is carried on the design of synthesized dyes with matrix structure of naphthaquinone, which is to make a foundation for further bionic synthesis.Reserch thoughts: 1. The naphthoquinone structure as matrix of target dyestuff;2. Synthetic natural pigment instead of extraction of the natural dyes ; 3. Matrix with 0rtho-hydroxynaphthoquinone or ortho-dihydroxy- naphthoquinone to improve the properties of the synthetic natural dyes; 4. Increase the molecular weight of the dyestuff through conjugate double bond;5.Intermediates with no or lower poison. 6. Increase the water solubility of synthetic natural dyes through introduction of water soluble groups.Keys and difficulties: 1.Compound with structure of ortho-hydroxy naphthoquinone or ortho-hydroxy naphthoquinone. 2.conjugate chain.This dissertation believes that the nonazo conjugated double bond is good. The position of conjugated double bond is essential. As to this point,I intend to make the structure with linerity, long chain and coplanarity. The mount of ortho-hydroxy should not be too much, it is better to have pairs of ortho-hydroxyl, At the same time, you must pay attention to the steric hindrance. As to the mordant, you had better choose those good for our environment, such as metal ions.