Phloroglucinol
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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)
C6H3(OH)3 . 2H2O 162.14 CAS RN®: 6099-90-7.-White or yellowish-white crystals or a crystalline powder. Soluble in alcohol and in ether, slightly soluble in water.
1 Insoluble in Alcohol
Dissolve 1 g in 20 mL of alcohol: a clear and complete solution results.
MELTING RANGE, Class la (741): between 215° and 219°.
2 Residue on Ignition (Reagent test)
Ignite 1 g with 0.5 mL of sulfuric acid: the residue weighs not more than 1 mg (0.1%).
3 Diresorcinol
Heat to boiling a solution of 100 mg in 10 mL of acetic anhydride, cool the solution, and superimpose it upon 10 mL of sulfuric acid: no violet color appears at the zone of contact of the liquids.
