| Identification | Back Directory | [Name]
4,5-Dibromo-1,2-benzenediol | [CAS]
2563-26-0 | [Synonyms]
NSC10858
550248_SIAL
ZINC00254871
4,5-dibromopyrocatechol
4,5-Dibromo-1,2-Benzenediol
1,2-BENZENEDIOL,4,5-DIBROMO-
Benzen-1,2-diol, 4,5-dibromo-
Pinaverium Bromide Impurity 8
4 5-DIBROMOBENZENE-1 2-DIOL 90% TECH
4,5-DIBROMOBENZENE-1,2-DIOL, 90% tech grade
4,5-Dibromobenzene-1,2-diol 90%, technical grade | [Molecular Formula]
C6H4Br2O2 | [MDL Number]
MFCD00233157 | [MOL File]
2563-26-0.mol | [Molecular Weight]
267.9 |
| Chemical Properties | Back Directory | [Melting point ]
111-116°C (lit.) | [Boiling point ]
328.5±37.0 °C(Predicted) | [density ]
2.257±0.06 g/cm3(Predicted) | [storage temp. ]
Sealed in dry,Room Temperature | [form ]
powder, crystals or chunks | [pka]
7.98±0.23(Predicted) |
| Hazard Information | Back Directory | [Uses]
4,?5-?Dibromobenzene-?1,?2-?diol is a dye. Dyes and metabolites. | [Synthesis]
4,5-Dibromo-1,2-benzenediol is obtained by reacting catechol with Bromine in CCl4.
Experimental procedure：In a 500mL three neck round bottom flask under nitrogen, equipped with a refluxcondenser, an addition funnel and a gas outlet connected to a bubbler filled with a 10%NaOH aqueous solution, was suspended catechol (136 mmol, 15.0 g, 1 eq.) in CCl4 (150mL). Bromine (272 mmol, 43.5 g, 2 eq.) diluted in CCla(20mL) was added dropwise at 0℃ over 4.5 h. The excess of bromine was neutralized with aqueous NaHSO4 (150mL,40% solution). The mixture was filtrated and the solids were dissolved in CCLa,washed with water and dried in vacuum. The obtained 4,5-dibromocatechol (30.2 g)was then recrystallized from CHCl3 (220 mL) to afford a white crystalline solid (22.5 g,62%).
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