CAS: 490-79-9, 2,5-dihydroxybenzoic acid technical description

English name: DHB; 2,5-Dihydroxybenzoic acid; Gentisic acid; Hydroquinonecarboxylic acid Other names: gentisic acid; 5-hydroxysalicylic acid CAS number: 490-79-9 (HO) 2C6H3CO2H=154.12 Grade: BR content: ≥ 99.0% Melting point: 204～208°C Free aldehyde: ≤0.8% Total aldehyde amount: ≥28.5% Properties: white or yellow powder, or needle-like or prismatic crystal. Unstable in the air. In case of ferric chloride, it is blue. It can restore the Ferien and Tollens reagents. Soluble in water, ethanol and ether, almost insoluble in carbon disulfide, chloroform and benzene. 200 ° C began to sublimate. Low toxicity, half lethal dose (rat, oral) 800mg/kg. Irritating use: biochemical research. Pharmaceutical intermediates. Save: RT, protected from light

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