FLAVANTHRONE

CAS NO.：475-71-8
Empirical Formula: C28H12N2O2
Molecular Weight: 408.41
MDL number: MFCD00046959
EINECS: 207-498-0
SAFETY DATA SHEET (SDS)
Update Date: 2026-04-24 14:58:25

What is FLAVANTHRONE?

Chemical properties

Brownish-yellow needles. Soluble in dilute alkaline solutions.

The Uses of FLAVANTHRONE

Vat dye for textiles, etc.

Synthesis

Flavanthrone is prepared from 1-chloro- 2-phthalimidoanthraquinone via the 2,2'- diphthalimido-1,1'-bianthraquinonyl, using copper in boiling trichlorobenzene. The alkaline ring closure is accomplished by boiling with excess 3 – 5 % sodium hydroxide, which cleaves both phthalic acid residues simultaneously . Only the unsubstituted flavanthrone is used as a vat dye and pigment.

Properties and Applications

TEST ITEMS	SPECIFICATION
APPEARANCE	YELLOW POWDER
SHADE	GREENISH
HEAT RESISTANCE	180 °C min
LIGHT FASTNESS	7
ACID RESISTANCE	5
ALKALI RESISTANCE	5
FASTNESS TO BLEEDING	5
OIL ABSORPTION	45-50%
SPECIFIC SURFACE	27 m ² /g
DENSITY	1.50 g/cm ³
RESIDUE ON 80 MESH	5.0% max
WATER SOLUBLE	1.0% max
VOLATITE 105 °C	1.0% max
TINTING STRENGTH	100-105 %

Properties of FLAVANTHRONE

Boiling point:	730.1±55.0 °C(Predicted)
Density	1.575±0.06 g/cm3(Predicted)
storage temp.	Sealed in dry,Room Temperature
solubility	Sulfuric Acid (Slightly)
form	Solid
Colour Index	70600
pka	-0.82±0.20(Predicted)
color	Very Dark Red to Very Dark Brown
CAS DataBase Reference	475-71-8
EPA Substance Registry System	Benzo[h]benz[5,6]acridino[2,1,9,8-klmna]acridine-8,16-dione (475-71-8)