Vat Blue 4B Chemical Properties

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)

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)

Safety Information

RTECS 

NM3259100

Vat Blue 4B Usage And Synthesis

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.

Preparation

(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

Vat Blue 4B(2475-31-2)Related Product Information

• Indigo Carmine
• Vat blue 43 (C.I. 53630),Vat blue 43 (C.I. 53630)
• Vat blue 14 (C.I. 69810),Vat blue 14 (C.I. 69810)
• Vat blue 4 (C.I. 69800),Vat Blue RSN UL Red Conc SPL,Vat Blue RSN Red SPL,Vat Blue RSN UL Red Conc SPL,Vat Blue RSN Red SPL,Vat blue 4 (C.I. 69800)
• Vat blue 42 (C.I. 53640),C.I. Vat Blue 42,C.I. Vat Blue 42,Vat blue 42 (C.I. 53640)
• Vat blue 6 (C.I. 69825),Vat blue 6 (C.I. 69825)
• Vat blue 19 (C.I. 59805),Vat blue 19 (C.I. 59805)
• Vat Blue 64
• Vat Blue 6, Solubilized
• 2-BROMO-N-METHYLANILINE 95
• 5-BROMOINDOLINE
• 3-BROMOPHENETHYLAMINE
• TRANS-1,2-DIBENZOYLETHYLENE
• Indigo VAT Blue 1,VAT BLUE 1,Indigo VAT Blue 1,VAT BLUE 1
• 1-(2-amino-5-bromophenyl)ethanone
• 3'-Bromoacetophenone
• Solubilised Vat Blue IBC,C.L.Solubilised Vat Blue 6,C.I.Solubilised Vat Blue 6,Solubilised Vat Blue IBC,C.L.Solubilised Vat Blue 6,C.I.Solubilised Vat Blue 6
• 4-BROMO-2-ETHYLANILINE