- Liquid azo dyes
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Any liquid azo dyes, in which auxochrome such as dialkylamino, alkoxy, and amino group is attached in a molecule, were produced. In a series of 2-alkyl-4'-(dimethylamino)azobenzenes, the butyl, hexyl, octyl, and dodecyl derivatives were liquid at room temperature, whereas the propyl, 1-methylethyl, 1-methylpropyl, 1,1-dimethylethyl, and octadecyl derivatives were solid. Thus, it is essential for liquid azo dyes to have a medium n-alkyl group at the 2-position. In a series of 2-butyl-4'-(dialkylamino)azobenzenes, the dimethylamino, diethylamino, dibutylamino, dioctylamino, and didodecylamino derivatives were liquid. 2-Butyl-4'-methoxyazobenzene and 4-amino-3,5-dimethyl-2'-butylazobenenzne were also liquid, whereas 2-butyl-4'-hydroxyazobenznene, 4-amino-2'-butylazobenzene, and 2-butyl-4'-(methylamino)azobenzene were solid. The prevention of π/π stacking, alkyl-alkyl interactions, and intermolecular hydrogen bond could produce liquid azo dyes.
- Biradar, Siddanagouda,Kasugai, Ryohei,Kanoh, Hisayoshi,Nagao, Hitoshi,Kubota, Yasuhiro,Funabiki, Kazumasa,Shiro, Motoo,Matsui, Masaki
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p. 249 - 258
(2015/11/17)
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- Synthesis of new azo dyes under phase-transfer catalysis
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New azo dyes that do not enter into azo coupling reactions under classical conditions (water solutions, polar organic solvents) were prepared by nontraditional method (in solutions in 1,2-dichloroethane and chloroform and in water emulsions thereof) with the use of phase-transfer catalysts (dibenzo-18-crown-6, benzyltrimethylammonium chloride, sodium 4-dodecylbenzenesulfonate). The azo dyes obtained: 4-(3-nitrophenylazo)-1-bromo-2-methoxynaphthalene, 4-(3-methylphenylazo)-1-bromo-2-methoxynaphthalene, 3-nitrophenylazochrysene, 3-methylphenylazochrysene were produced in high yields and showed good processing properties.
- Chirakadze,Elizbarashvili,Baidoshvili
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p. 1642 - 1645
(2007/10/03)
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