IUPAC Name: 8-Hydroxy-5,7-dinitronaphthalene-2-sulfonic acid
Synonyms of  Flavianic acid (CAS NO.483-84-1) : 2,4-Dinitro-1-naphthol-7-sulfonic acid ; 2,4-Dinitronaphtholsulfonic acid ; 8-Hydroxy-5,7-dinitro-2-naphthalenesulfonic acid ; 2-Naphthalenesulfonic acid, 5,7-dinitro-8-hydroxy- ; 2-Naphthalenesulfonic acid, 8-hydroxy-5,7-dinitro-
CAS NO:483-84-1
Molecular Formula:C₁₀H₆N₂O₈S
Molecular Weight :314.2282
Molecular Structure :
EINECS: 207-600-3
Index of Refraction: 1.744
Surface Tension: 101.4 dyne/cm
Density: 1.865 g/cm³
Melting Point: 148-151 °C(lit.)
Appearance: Flavianic acid (CAS NO.483-84-1) is light yellow needle crystal.
Solubility:Soluble in water and alcohol.

 Flavianic acid (CAS NO.483-84-1) is used as intermediates in organic synthesis, organic alkali precipitation agent and amino acid reagents. The product reacts with more than 50 kinds of metal ions, but only in acidic solution with the zirconium, lead precipitated for determination of zirconium with the selectivity and high sensitivity.

 Flavianic acid (CAS NO.483-84-1) can be derived from by the sulfonation and nitration of α-Naphthol. Adding 200g25% fuming sulfuric acid slowly into 50g α-naphthol, with stirring to be dissolved , reaction at 125 ℃ for 1h. After reaction is completed, cooling, mixed with 500g ice , filtered. In the filtrate ,add 120g the relative density of 1.40 of concentrated nitric acid , heating 1.5h at 50 ℃.Set reactants at room temperature for 12h, filtered, recrystallized with dilute hydrochloric acid, drying ,that was the Flavianic acid (CAS NO.483-84-1).

Reported in EPA TSCA Inventory.

Mutation data reported. When heated to decomposition it emits toxic vapors of NO_x and SO_x.

Hazard CodesC
Risk Statements 34-40
R34:Causes burns. 
R40:Limited evidence of a carcinogenic effect.
Safety Statements 22-26-36/37/39-45
S22:Do not breathe dust. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR UN 1759 8/PG 3
WGK Germany 3
RTECS QK1810000
HazardClass 8
PackingGroup III