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DIBENZANTHRONE

CAS No.116-71-2
Chemical Name:DIBENZANTHRONE
CBNumber:CB1693094
Molecular Formula:C34H16O2
Formula Weight:456.49
MOL File:116-71-2.mol

DIBENZANTHRONE Property

Melting point 338-339 °C
Boiling point 522.64°C (rough estimate)
Density 1.1055 (rough estimate)
refractive index 1.4875 (estimate)
storage temp. Sealed in dry,Room Temperature
CAS DataBase Reference 116-71-2(CAS DataBase Reference)
EWG's Food Scores 1
FDA UNII VH1DQP6QPQ
NIST Chemistry Reference Dibenzanthrone(116-71-2)
EPA Substance Registry System Violanthrone (116-71-2)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal wordWarning
Hazard statements H302-H315-H319-H335
Precautionary statements P261-P305+P351+P338

DIBENZANTHRONE Chemical Properties,Usage,Production

Description Violanthrone, Indanthren Dark Blue BOA,is generated by potash fusion of benzanthrone , . Direct potash fusion leads to side products, such as isoviolanthrone and 4-hydroxybenzanthrone. The crude product may be used directly or in mixtures with other dyes in vat dyeing. It is also used to generate violanthrone derivatives. Several processes have been developed to decrease the amounts of undesirable side products of the direct potash fusion of benzanthrone or to purify the bibenzanthronyl or the crude violanthrone . Especially effective is the addition of high-boiling solvents such as naphthalene, the so-called low carbazole anthracene residues, or sodium acetate to the melt. The quality of the products prepared by these methods is satisfactory for the production of almost all violanthrone dyes.
General Description Bluish-black to black powder.
Air & Water Reactions Insoluble in water.
Fire Hazard Flash point data for DIBENZANTHRONE are not available. DIBENZANTHRONE is probably combustible.
Flammability and Explosibility Not classified
Synthesis Violanthrone of high purity is obtained from 4,4'-bibenzanthronyl (153) by alkaline or acid ring closure, preferably in the presence of oxidizing agents , . If this ring closure is carried out in sulfuric acid with an excess of manganese dioxide, the 16,17- violanthronequinone (155) is obtained. This can be reduced readily with sodium hydrogen sulfite to 16,17-dihydroxyviolanthrone (156). Subsequent alkylation of the hydroxy groups yields very fast navy-blue to brilliant-green vat dyes. The dimethyl ether (157) is the well-known dye Caledon Jade Green or Indanthren Brilliant Green B and FFB (extremely pure form).

Properties and Applications

TEST ITEMS	SPECIFICATION
APPEARANCE	BLUE POWDER
SHADE	REDDISH
HEAT RESISTANCE	300 °C min
LIGHT FASTNESS	8
ACID RESISTANCE	5
ALKALI RESISTANCE	5
FASTNESS TO BLEEDING	5
OIL ABSORPTION	40-50%
SPECIFIC SURFACE	27 m ² /g
DENSITY	1.60 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 %