Vat Yellow 4

Chemical properties

viscous orange liquid

The Uses of Vat Yellow 4

Vat Yellow 4 is a commercial dye used in textiles. Polyaromatic hydrocarbon with potential carcinogenic activity.Environmental toxin on US EPA Toxic Release Inventory list (TRI) list.

Preparation

(a) 3-Benzoylbenzanthrone?and Aluminium chloride and antioxidant for the closed-loop response; (b) 1,5-Dibenzoyl-2-naphthaene?in Aluminium chloride and sodium chloride were under existing closed-loop response.

Definition

ChEBI: Vat Yellow 4 is an ortho- and peri-fused polycyclic arene.

General Description

Viscous orange liquid. Used for coloring of cotton, wool and cellulose acetate.

Air & Water Reactions

Water soluble.

Reactivity Profile

Vat Yellow 4 reacts very readily with reducing agents to give a colorless or nearly colorless product. Subsequent oxidation then restores the color.

Health Hazard

ACUTE/CHRONIC HAZARDS: When heated to decomposition Vat Yellow 4 emits acrid smoke and irritating fumes.

Fire Hazard

Vat Yellow 4 is probably combustible.

Synthesis

7,14-Dibenzpyrenequinone, Indanthren Golden Yellow GK, is prepared from 1,5-dibenzoylnaphthalene (itself prepared from naphthalene with benzoyl chloride – AlCl3) by fusion with AlCl3-NaCl at 160 ?C and aeration with oxygen , , .

Properties and Applications

red light yellow. Yellow brown powder. Soluble in nitrobenzene, four hydrogenated naphthalene and dimethyl benzene, slightly soluble in acetone, ethanol, benzene, chloroform, o-chlorophenol, Pyridine and toluene. The strong sulfuric acid to red light purple, orange after diluted precipitation, in alkaline insurance powder is in stock for purplish red color; In the acidic insurance powder also in stock for golden brown. Can be used for the discharge printing of cotton, mainly used in the winter sun often dark cotton print, also suitable for silk and polyamide fiber dyeing.