Pyrogallol

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For Research Use Only.

Category

Phenols

Cat.No.

NP4599

CAS

87-66-1

Product Name

Pyrogallol

Structure

Product Details

Description

Pyrogallol is a colorant and opacifier, and has antiseptic and antipsoriatic properties.

Synonyms

1,2,3-Benzenetriol; 1,2,3-Trihydroxybenzene; 2,3-Dihydroxyphenol; Pyrogallol Acid 2,6-Dihydroxyphenol; Antioxidant PY; Fouramine Brown AP; Fourrine 85; Fourrine PG; NSC 5035; Pyrogallic Acid

IUPAC Name

benzene-1,2,3-triol

Molecular Weight

126.11

Molecular Formula

C6H6O3

Canonical SMILES

C1=CC(=C(C(=C1)O)O)O

InChI

InChI=1S/C6H6O3/c7-4-2-1-3-5(8)6(4)9/h1-3,7-9H

InChIKey

WQGWDDDVZFFDIG-UHFFFAOYSA-N

Boiling Point

309.0±0.0°C at 760 mmHg

Melting Point

131-134°C

Flash Point

>230 °F

Purity

≥98%

Density

1.5±0.1 g/cm3

Solubility

Soluble in Methanol (Slightly), Water (Sparingly)

Appearance

White to Pale Brown Solid

Storage

Store at 2-8°C under inert atmosphere

BRN

907431

Chemical Properties

White or nearly white needle- or
leaf-shaped crystals or crystalline powder.Pyrogallol is practically odorless.

Color

White

Definition

ChEBI: A benzenetriol carrying hydroxy groups at positions 1, 2 and 3.

EINECS

201-762-9

Form

Very Fine Crystalline Powder

Hazard Class

Hazard Codes

6.1

HS Code

2907 29 00

Packing Groups

III

4-5 (50g/L, H2O, 20 °C)

pKa

pK1:9.03(0);pK2:11.63(+1) (25°C)

Refractive Index

n20/D 1.387

RIDADR

UN 2811 6.1/PG 3

Risk Statements

20/21/22-52/53-68-40-36/38

RTECS

UX2800000

Safety Statements

22-24/25-61-36/37-26

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.

Toxicity

LD50 orally in rabbits: 1.6 g/kg (Dollahite)

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.

Vapor Density

4.4 (vs air)

Vapor Pressure

10 mm Hg ( 167.7 °C)

Water Solubility

400 g/L (25 °C)

WGK Germany

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