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| OEM | OEM Services Provided |
| Feature | Good stability,Easy to Use |
| Classification | Dyes and Pigments |
| Advantage | Professional, Fast Delivery, Customizable | Samples | Apply for free，Contact us now. |
| Product Name: | Vat Blue 4B |
| Synonyms: | BASF brilliant indigo;Vat blue 5 (C.I. 73065);Pigment organic indigo blue bromindigo EINecs;04BS;Arlanon Blue 2B;Bromo Indigo 2B;Convat Blue E;Kambanthrene bndigo 4B |
| CAS: | 2475-31-2 |
| MF: | C16H6Br4N2O2 |
| MW: | 577.85 |
| EINECS: | 219-598-1 |
| Product Categories: | |
| Mol File: | 2475-31-2.mol |
| Boiling point | 563.4±50.0 °C(Predicted) |
| density | 2.5583 (rough estimate) |
| refractive index | 1.6300 (estimate) |
| Colour Index | 73065 |
| pka | -7.15±0.20(Predicted) |
| form | solid |
| InChI | InChI=1S/C16H6Br4N2O2/c17-5-1-7-11(9(19)3-5)21-13(15(7)23)14-16(24)8-2-6(18)4-10(20)12(8)22-14/h1-4,21-22H |
| InChIKey | PTWYQANXSNMUTI-UHFFFAOYSA-N |
| SMILES | N1C2=C(C=C(Br)C=C2Br)C(=O)C1=C1C(=O)C2=C(N1)C(Br)=CC(Br)=C2 |
| CAS DataBase Reference | 2475-31-2(CAS DataBase Reference) |
| NIST Chemistry Reference | c.i. Vat blue 5(2475-31-2) |
| EPA Substance Registry System | 3H-Indol-3-one, 5,7-dibromo-2-(5,7-dibromo-1,3-dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro- (2475-31-2) |
| RTECS | NM3259100 |
| Uses | Ciba Blue 2B (CAS# 2475-31-2) is a halogenated indigo dye and pollutant contributing 1,3,6,8-tetrabromocarbazole and some other halogenated carbazoles to the environment. | ||||||||||||||||||||||||||
| (a) and Acetic anhydride in the presence of Sodium acetate trihydrate in Acetic acid glacial will 3H-indol-3-one,2-(1,3-dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-? ?tetrabromide?(FIAT764); (b) in the boiling Nitrobenzene with Bromine will 3H-indol-3-one,2-(1,3-dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro- four bromination, (C) 3H-indol-3-one,2-(1,3-dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro- in Chlorosulfonic acid (GP 225227) or in Sulfuryl chloride (GP 229304) and bromine reaction. | |||||||||||||||||||||||||||
| Properties and Applications | blue. Dark blue powder. Etanol and insoluble in water, soluble in Xylene, Nitrobenzene and 1, 2, 3, 4 – Tetrahydronaphthalene. Alkaline reduction leuco for yellow; Acid reduction leuco for pale yellow. In concentrated sulfuric acid to blue light green, diluted into blue, and the emergence of precipitation. Used for cotton of jig dyeing and yarn dyeing, dyeing hair blue cloth color turquoise blue. Is the important dye printing, can direct printing, also can discharge printing and resist printing. Can also be used for viscose, silk and wool dyeing, levelness and affinity are good. Can be processed into organic pigment
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| Raw materials | Indigo-->Indigo |
| Preparation Products | disodium 5,5',7,7'-tetrabromo[2,2'-bi-1H-indole]-3,3'-diyl disulphate-->3H-Indol-3-one,5-dromo-2-1,3-dihydro-3-oxo-2H-indol-2-ylidene-1,2-dihydro |
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