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Physical and chemical properties of Pyrogallol CAS 87-66-1
Properties: White odorless crystals. There is a bitter taste. It turns gray when exposed to air and light.
Melting point: 43-47°C (lit.).
Boiling point: 309°C.
Density: 1.112g/mLat25°C(lit.).
Vapor density: 4.4 (vsair).
Vapor pressure: 10mmHg (167.7°C).
Refractive index n20/D: 1.387.
Flash point>230°F.
Acidity coefficient (pKa): pK1:9.03(0); pK2:11.63(+1)(25°C).
PH value: 4-5 (50g/l, H2O, 20°C).
Solubility: soluble in water, ethanol, ether, slightly soluble in benzene, chloroform, carbon disulfide.
Water solubility: 400g/L (25ºC).
Stability: Stable at room temperature, but will change color under light. Combustibles, incompatible with strong oxidants, alkalis, metal oxides, ammonia, phenol, iodine, lime water, menthol, potassium permanganate, strong alkalis, etc. 

Production method of Pyrogallol CAS 87-66-1
Add gallic acid and water into the autoclave, decarboxylate at 200-210°C for 0.5h, decolorize, filter, and evaporate to obtain a finished product, or use vacuum sublimation for refining.

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Pyrogallol CAS 87-66-1
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