IMPORTANT SYNTHESIS OF DYES
by : Rahul Sharma
IMPORTANT SYNTHESIS OF DYES:-
1. Direct Black-EW
[m-PDA] H+ <--- [Benzidine] ---> H+[H-acid] OH <--- [Aniline]
2. Naphthol Blue Black-6B
[Aniline] ---> OH- [H-acid] H+ <--- [p-Nitroaniline]
3. Metanil Yellow
[Metanilic acid] ---> H+ [Diphenyl amine]
4. Methyl Orange (Orange-III)
[Sulfanilic acid] ---> H+ [N, N-Dimethyl aniline]
5. Congo Red
[Benzidine ---> 2Naphthionic acid]
6. Indanthrene Yellow-4GK (Indanthrone)
[(Formamide + 1 ,5-diaminoanthraquinone) + 2,5-dichlorobenzoyl chloride]
7. Eriochrome Black-T
(4-amino-7-nitro-3-naphthol-T-sulfonic acid a-naphthol i.p.o CuSO4 at position 1)
8. Eriochrome Red-B
(4-amino-7-nitro-3-naphthol-1-sulfonic acid ---> 3-methyl-I-phenyn-5-pyrazolone)
9. Procion Brilliant Red
[Aniline Cyanurated H-Acid]
10. Tartrazine
[Na-salt of p-hydrazino benzene sulfonic acid]+ [Dioxy succinic acid] + [Na-salt of hydrazino benzene- sulfonic acid]
11. Reactive Yellow-3
[C-acid (2-amino naphthalene 4,8-disulfonic acid) ---> Cyanunued m amino acetanilide]
