Orcinol
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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)
(5-Methylresorcinol), C7H8O2 · H2O 142.15 CAS RN®: 6153-39-5. - White to light tan crystals.
Assay: Transfer about 60 mg, accurately weighed, to a 100-mL volumetric flask, dissolve in methanol, dilute with methanol to volume, and mix.
Transfer 5.0 mL of this solution to a 50-mL volumetric flask and dilute with methanol to volume, and mix. Using a suitable spectrophotometer, 1-cm cells, and methanol as the blank, record the absorbance of the solution at the wavelength of maximum absorbance at about 273 nm. From the observed absorbance, calculate the absorptivity (see Ultraviolet-Visible Spectroscopy 〈857〉): the absorptivity is not less than 13.2, corresponding to not less than 98% of C7H8O2 · H2O.
Melting Range 〈741〉: between 58° and 61°.
