DIBENZANTHRONE CAS# 116-71-2
| DIBENZANTHRONE Basic information |
| Product Name: |
DIBENZANTHRONE |
| Synonyms: |
sandothrenedarkbluenbo;sandothrenedarkbluenboa;sandothrenedarkbluenmba;Solanthrene Dark Blue B;Solanthrene Dark Blue BA;Solanthrene Dark Blue F-BA;Vat Dark Blue BO UL Conc;VAT BLUE 20 |
| CAS: |
116-71-2 |
| MF: |
C34H16O2 |
| MW: |
456.49 |
| EINECS: |
204-152-0 |
| Product Categories: |
Organics |
| Mol File: |
116-71-2.mol |
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| DIBENZANTHRONE Chemical Properties |
| 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) |
| NIST Chemistry Reference |
Dibenzanthrone(116-71-2) |
| EPA Substance Registry System |
Violanthrone (116-71-2) |
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| DIBENZANTHRONE Usage And Synthesis |
| 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).
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| Properties and Applications |
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TEST ITEMS
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SPECIFICATION
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APPEARANCE
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BLUE POWDER
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SHADE
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REDDISH
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HEAT RESISTANCE
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300 °C min
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LIGHT FASTNESS
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8
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ACID RESISTANCE
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5
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ALKALI RESISTANCE
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5
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FASTNESS TO BLEEDING
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5
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OIL ABSORPTION
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40-50%
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SPECIFIC SURFACE
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27 m 2 /g |
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DENSITY
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1.60 g/cm 3 |
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RESIDUE ON 80 MESH
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5.0% max
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WATER SOLUBLE
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1.0% max
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VOLATITE 105 °C
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1.0% max
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TINTING STRENGTH
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100-105 %
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