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Pyrogallol

Pyrogallol Structure
Pyrogallol
  • CAS No.87-66-1
  • Chemical Name:Pyrogallol
  • CBNumber:CB6107909
  • Molecular Formula:C6H6O3
  • Formula Weight:126.11
  • MOL File:87-66-1.mol
Pyrogallol Property
  • Melting point: :43-47 °C(lit.)
  • Boiling point: :309 °C
  • Density  :1.112 g/mL at 25 °C(lit.)
  • vapor density  :4.4 (vs air)
  • vapor pressure  :10 mm Hg ( 167.7 °C)
  • refractive index  :n20/D 1.387
  • Flash point: :>230 °F
  • storage temp.  :Store below +30°C.
  • solubility  :water: soluble
  • form  :Very Fine Crystalline Powder
  • pka :pK1:9.03(0);pK2:11.63(+1) (25°C)
  • color  :White
  • PH :4-5 (50g/l, H2O, 20℃)
  • Water Solubility  :400 g/L (25 ºC)
  • Sensitive  :Light Sensitive
  • Merck  :14,8000
  • BRN  :907431
  • Stability: :Stability Stable, but decolourises in light. Combustible. Incompatible with strong oxidising agents, alkalies, metal oxides, ammonia, antipyrine, phenol, iodine, lime water, menthol, potassium permanganate, strong bases.
  • InChIKey :WQGWDDDVZFFDIG-UHFFFAOYSA-N
  • FDA 21 CFR :73.1375
  • CAS DataBase Reference :87-66-1(CAS DataBase Reference)
  • EWG's Food Scores :4-7
  • FDA UNII :01Y4A2QXY0
  • NIST Chemistry Reference :1,2,3-Benzenetriol(87-66-1)
  • EPA Substance Registry System :Pyrogallol (87-66-1)
Safety
Hazard and Precautionary Statements (GHS)
  • Symbol(GHS)
  • Signal wordWarning
  • Hazard statements H302-H312-H332-H341-H412-H302+H312+H332-H315-H319
  • Precautionary statements P273-P280-P305+P351+P338-P201-P261-P304+P340-P405-P501a
Pyrogallol Price More Price(36)
  • Brand: Sigma-Aldrich
  • Product number: 8.22302
  • Product name : Pyrogallol
  • Purity: for synthesis
  • Packaging: 50 g
  • Price: $53.83
  • Updated: 2021/03/22
  • Buy: Buy
  • Brand: Sigma-Aldrich
  • Product number: 1.00612
  • Product name : Pyrogallol
  • Purity: GR for analysis ACS,Reag. Ph Eur
  • Packaging: 50 g
  • Price: $89.91
  • Updated: 2021/03/22
  • Buy: Buy
  • Brand: Sigma-Aldrich
  • Product number: 8.22302
  • Product name : Pyrogallol
  • Purity: for synthesis
  • Packaging: 250 g
  • Price: $236.8
  • Updated: 2021/03/22
  • Buy: Buy
  • Brand: Sigma-Aldrich
  • Product number: 16040
  • Product name : Pyrogallol
  • Purity: ACS reagent, ≥99%
  • Packaging: 100 g
  • Price: $108
  • Updated: 2021/03/22
  • Buy: Buy
  • Brand: Sigma-Aldrich
  • Product number: 06931
  • Product name : Pyrogallol
  • Purity: analytical standard
  • Packaging: 50mg
  • Price: $119
  • Updated: 2021/03/22
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Pyrogallol Chemical Properties,Usage,Production

  • Chemical Properties white crystalline solid
  • Chemical Properties White or nearly white needle- or leaf-shaped crystals or crystalline powder.Pyrogallol is practically odorless.
  • Uses Pyrogallol is used in the manufacture of various dyes; in dyeing furs, hairs, and feathers; for staining leather; in engraving;as a developer in photography; and as an analytical reagent..
  • Uses

    Pyrogallol possesses importance as a spectrophotometric reagent in the determination of niobium and tantalum. The absorptions of niobium and tantalum complexes are usually measured at 340 and 335 nm, respectively. The niobium complex is formed in slightly acidic medium, and the tantalum complex in strongly acidic medium (4 N HC1). The absorption spectra are pH-dependen.

  • Uses Complexing agent; reducing agent; alkaline solution indicator for gaseous oxygen.
  • Definition ChEBI: A benzenetriol carrying hydroxy groups at positions 1, 2 and 3.
  • Production Methods Pyrogallol is prepared by heating dried gallic acid at about 200°C with the loss of carbon dioxide or by the chlorination of cyclohexanol to tetrachlorocyclohexanone, followed by hydrolysis.
  • General Description Odorless white to gray solid. Sinks and mixes with water.
  • Air & Water Reactions Turns gray on exposure to light or air. Water soluble.
  • Reactivity Profile Pyrogallol is a strong reducing agent. Reacts with alkalis, NH3, antipyrine, camphor, phenol, iron and lead salts, iodine, lime water, menthol and KMnO4.
  • Hazard Toxic by ingestion and skin absorption.
  • Health Hazard The toxic symptoms are similar to those of phenol. It can enter the body by absorption through skin and ingestion. The poisoning effects are nausea, vomiting, gastritis, hemolysis, methemoglobinemia, kidney and liver damage, convulsions, and congestion of lungs. High doses can cause death. Ingestion of 2–3 g of solid can be fatal to humans. The LD50 values varied widely in species. The oral LD50 value in mice is about 300 mg/kg.
  • Health Hazard Inhalation of dust causes irritation of nose and throat. Ingestion may cause severe gastrointestinal irritation, convulsions, circulatory collapse, and death. Contact with eyes causes irritation. Skin contact can cause local discoloration, irritation, eczema, and death; repeated contact can cause sensitization.
  • Fire Hazard Pyrogallol is probably combustible.
  • Contact allergens Pyrogallol belongs to the phenols group. It is an old photograph developer and a low sensitizer in hair dyes.
  • Safety Profile Human poison by ingestion and subcutaneous routes. An experimental poison by ingestion, subcutaneous, intravenous, and intraperitoneal routes. Experimental teratogenic and reproductive effects. Questionable carcinogen with experimental tumorigenic data. Mutation data reported. 1 198 PPRSOO PYROSULFURYL CHLORIDE Readdy absorbed through the skin. Human systemic effects by ingestion: convulsions, dyspnea, gastrointestinal effects. A severe skin and eye irritant. Incompatible with alkalies, NH3, antipyrine, phenol, iron and lead salts, iodine, KMn04. When heated to decomposition it emits acrid smoke and irritating fumes. Used as a topical antibacterial agent, as an intermediate, hair dye component, and analytical reagent.
  • Carcinogenicity Pyrogallol was not carcinogenic in mouse and rabbit chronic dermal studies. Mice were treated twice weekly with pyrogallol in acetone (50%) on the shaved flank for life. There was no increase in dermal or systemic tumors. A similar study in rabbits also revealed no skin tumors, although positive controls showed an increase in tumors in both mice and rabbits.
    Pyrogallol was considered to be cocarcinogenic when administered dermally three times a week together with the skin carcinogen benzo[a]pyrene for 440 days; pyrogallol administered alone caused no increase in skin tumors.
Pyrogallol Preparation Products And Raw materials
Raw materials
Preparation Products
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