475-71-8

Name	FLAVANTHRONE
CAS	475-71-8
EINECS(EC#)	207-498-0
Molecular Formula	C28H12N2O2
MDL Number	MFCD00046959
Molecular Weight	408.41
MOL File	475-71-8.mol

Chemical Properties

Appearance	Brownish-yellow needles. Soluble in dilute alkaline solutions.
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)
Colour Index	70600
form	Solid
pka	-0.82±0.20(Predicted)
color	Very Dark Red to Very Dark Brown
Uses	Vat dye for textiles, etc. less more
CAS DataBase Reference	475-71-8
EPA Substance Registry System	Benzo[h]benz[5,6] acridino[2,1,9,8-klmna]acridine8,16-dione(475-71-8)

Safety Data

Safety Statements

22-24/25

Raw materials And Preparation Products

Hazard Information

Chemical Properties

Brownish-yellow needles. Soluble in dilute alkaline solutions.

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 %

Supplier

J & K SCIENTIFIC LTD.

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