2,6-Dibromoquinone-chlorimide
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
(2,6-Dibromo-N-chloro-p-benzoquinone Imine; DBQ Reagent), O:C H Br :NCl 299.35 CAS RN®: 537-45-1.—A yellow, crystalline powder.
Insoluble in water; soluble in alcohol and in dilute alkali hydroxide solutions.
Melting Range 〈741〉: between 82° and 84°.
Solubility in Alcohol: A solution of 100 mg in 10 mL of alcohol is not more than faintly turbid.
Residue on Ignition (Reagent test): Ignite 500 mg with 0.5 mL of sulfuric acid: the residue weighs not more than 1 mg (0.2%).
Sensitiveness: To 10 mL of a water solution containing 0.01 mg of phenol add 0.3 mL of a sodium borate buffer (made by dissolving 2.84 g of crystallized sodium borate in 90 mL of warm water, adding 8.2 mL of 1 N sodium hydroxide, and diluting with water to 100 mL) and 0.1 mL of a solution of 10 mg of the test specimen in 20 mL of alcohol: a distinct blue color develops within 10 minutes.
