ChemicalBook CAS DataBase List 9,10-Dibromoanthracene

9,10-Dibromoanthracene synthesis

11synthesis methods

Product Name:9,10-Dibromoanthracene
CAS Number:523-27-3
Molecular formula:C14H8Br2
Molecular Weight:336.02

9,10-Dibromoanthracene is synthesized by the bromination of anthracene. The bromination reaction is carried out at room temperature using carbon tetrachloride as a solvent. Using 80-85% anthracene as raw material, adding bromine to react for half an hour, the yield is 83-88%.

77-48-5
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120-12-7 Synthesis

120-12-7
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1564-64-3 Synthesis

1564-64-3
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523-27-3
390 suppliers
$6.00/5g

Yield:-

Reaction Conditions:

Stage #1: 1,3-dibromo-5,5-dimethylimidazolidine-2,4-dione;anthracene in ethyl acetate; for 2.5 h;Refluxing;
Stage #2: in tetrahydrofuran;

Steps:

Anthracene (50 g, 0.28 mol, 1 eq) and 1,3-dibromo-5,5-dimethylhydantoin (38.15 g, 0.133 mol, 0.475 eq) were combined in a 500 mL of ethyl acetate and brought to reflux. After about 5 min of reflux, the mixture became homogeneous, and yellow, and stayed light in color throughout the 2.5 h that it was refluxed. The reaction mixture allowed to cool and then washed with water to remove the 5,5-dimethylhydantoin. When water was added, the mixture turned greenish-blue and the color persisted through additional aqueous washes. The organic layer was dried over Na₂SO₄and the greenish color gradually disappeared, and the mixture became orange-brown. The liquor was concentrated to dryness, to yield a brown solid residue. The solid was dissolved in hot THF (about 50 mL) and then slowly it was precipitated again with addition of acetonitrile (about 200 mL). The yellowish solid was isolated by filtration (36.4 g) and the process was repeated twice to yield two more crops of solid (total 23.8 g). The 3 crops were combined and analyzed by high performance liquid-chromatography (HPLC). The analysis indicated that only 89% of the reaction product was the desired 9-bromoanthracene, 9.3% was unreacted anthracene and 1% was the undesirable 9,10-dibromoanthracene. The 9,10-dibromoanthracene could not be removed by recrystallization.

References:

US2005/245752,2005,A1 Location in patent:Page/Page column 8

120-12-7 Synthesis

120-12-7
318 suppliers
$10.00/5g

523-27-3
390 suppliers
$6.00/5g

References

1564-64-3 Synthesis

1564-64-3
424 suppliers
$8.00/5g

523-27-3
390 suppliers
$6.00/5g

References

120-12-7 Synthesis

120-12-7
318 suppliers
$10.00/5g