Chemical Properties
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PYROGALLOL RED

Chemical Properties
Product Name
PYROGALLOL RED
CAS No.
32638-88-3
Chemical Name
PYROGALLOL RED
Synonyms
PR;PYROGALLOLUM;PYROGALLOL RED;PyrogallolRedGr;PYROGALLIC ACID;PYROGALLOL RED AR;PYROGALLIC ACID RED;1,2,3-BENZENETRIOL RED;PYROGALLOL RED-LACTONE;Pyrogallol Red,98%,pure
CBNumber
CB1314191
Molecular Formula
C19H12O8S
Formula Weight
400.36
MOL File
32638-88-3.mol
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PYROGALLOL RED Property

Melting point:
133-134 °C(lit.)
Boiling point:
309 °C(lit.)
Density 
1.082 g/mL at 20 °C
vapor density 
4.4 (vs air)
vapor pressure 
10 mm Hg ( 167.7 °C)
refractive index 
n20/D 1.387
storage temp. 
Inert atmosphere,Room Temperature
form 
Liquid
pka
7.86±0.20(Predicted)
color 
Dark brown
Water Solubility 
Soluble in water, ammonium hydroxide (10 mg/ml), and ethanol.
BRN 
363738
InChI
InChI=1S/C19H12O8S/c20-12-7-5-10-17(15(12)22)26-18-11(6-8-13(21)16(18)23)19(10)9-3-1-2-4-14(9)28(24,25)27-19/h1-8,20-23H
InChIKey
KUQNCHZOCSYKOR-UHFFFAOYSA-N
SMILES
S1(=O)(=O)C2=CC=CC=C2C2(C3=C(C(O)=C(O)C=C3)OC3=C2C=CC(O)=C3O)O1
CAS DataBase Reference
32638-88-3
EPA Substance Registry System
Spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]-3',4',5',6'-tetrol, 1,1-dioxide (32638-88-3)
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Safety

Hazard Codes 
Xn,Xi
Risk Statements 
20/21/22-52/53-68-36/37/38
Safety Statements 
36/37-61-24/25-22-36-26
RIDADR 
UN 2811 6.1/PG 3
WGK Germany 
3
RTECS 
UX2800000
8
TSCA 
Yes
HS Code 
2934 99 90
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Hazard and Precautionary Statements (GHS)

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
P8759
Product name
Pyrogallol Red
Packaging
5g
Price
$198
Updated
2024/03/01
Sigma-Aldrich
Product number
1.07534
Product name
Pyrogallol red
Purity
metal indicator
Packaging
1g
Price
$232
Updated
2024/03/01
TCI Chemical
Product number
P0572
Product name
Pyrogallol Red
Packaging
1g
Price
$53
Updated
2024/03/01
TCI Chemical
Product number
P0572
Product name
Pyrogallol Red
Packaging
5g
Price
$151
Updated
2024/03/01
TCI Chemical
Product number
P1976
Product name
Pyrogallol Red [for Protein Research]
Packaging
1g
Price
$106
Updated
2024/03/01
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PYROGALLOL RED Chemical Properties,Usage,Production

Chemical Properties

Also know nas pyrogallol and 1,2,3-trihydroxy-benzene,C6H3(OH)3 is white,lustrous crystals that turn gray on exposure to light. It is soluble in water,alcohol,and ether. A solution of pyrogallol acquires a brown color on exposure to air. This absorption of oxygen and change of color take place rapidly when the solution is made alkaline. Derivation is by heating gallic acid in an autoclave with three times its weight of water.
Uses are as a protective colloid in preparation of metallic colloidal solutions, photography, dyes, intermediates, synthetic drugs, medicine (antibacterial), process engraving, laboratory reagent, gas analysis (an oxygen absorber), reducing agent, and antioxidant in lubricating oils.

Chemical Properties

dark brown powder

Uses

The white powdery crystal was made by the superheating of gallic acid. Pyrogallic acid, popularly known as pyro, is one of the earliest developers and its use has spanned three centuries. It was first used in an acid state to physically develop wet collodion negatives. When silver bromide gelatin plates were adopted pyro was used again but in an alkaline state for chemical development. It was used throughout the 20th century and often chosen for the peculiar yellow stain it imparted to gelatin negatives.

Uses

Pyrogallol Red is a complexometric indicator for the metal elements molybdenum and copper. Dyes and metabolites.

Purification Methods

It is recrystallised from aqueous alkaline solution (Na2CO3 or NaOH) by precipitation on acidification, filter it off and dry in a vacuum. [Suk Collect Czech Chem Commun 31 3127 1966, Beilstein 19 H 407, 19 II 417, 19 III/IV 599, 19/10 V 226.]

PYROGALLOL RED Preparation Products And Raw materials

Raw materials

Preparation Products

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PYROGALLOL RED Suppliers

SIGMA-RBI
Tel
--
Fax
--
Country
Switzerland
ProdList
6896
Advantage
91
DKSH Switzerland Ltd.
Tel
--
Fax
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Country
Switzerland
ProdList
520
Advantage
77
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View Lastest Price from PYROGALLOL RED manufacturers

Hubei Lidu New Material Technology Co., Ltd
Product
PYROGALLOL RED 32638-88-3
Price
US $0.00-0.00/g
Min. Order
1g
Purity
95%
Supply Ability
20tons
Release date
2024-09-24
Hebei Weibang Biotechnology Co., Ltd
Product
PYROGALLOL RED 32638-88-3
Price
US $0.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
500000kg
Release date
2024-10-30
Hebei Yanxi Chemical Co., Ltd.
Product
PYROGALLOL RED 32638-88-3
Price
US $40.00/kg
Min. Order
1kg
Purity
0.99
Supply Ability
10 tons
Release date
2023-10-09

32638-88-3, PYROGALLOL REDRelated Search:


  • PYROGALLOL RED INDICATOR FOR &
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  • Pyrogallol Red, pure, 98%
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  • spiro[3h-2,1-benzoxathiole-3,9’-[9h]xanthene]-3’,4’,5’,6’-tetrol,1,1-dioxide
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  • Pyrogallol Red,98%,pure
  • PYROGALLOL RED METAL INDICATOR
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  • 3',4',5',6'-tetrahydroxyspiro[benzo[c][1,2]oxathiole-3,9'-xanthene] 1,1-dioxide
  • 1,2,3-BENZENETRIOL RED
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  • PYROGALLOSULFONPHTHALEIN
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  • Pyrogallolred,monohydrate
  • Pyrogallolsulfonphalein
  • 2-(3,4,5,6,9-PENTAHYDROXYXANTHEN-9-YL)BENZENESULFONIC ACID-9-LACTONE
  • Pyrogallolsulfonphthalein (PR)
  • PYROGALLOL RED AR
  • 3',4',5',6'-Tetrahydroxyspiro[benzo[c][1,2]oxathiole-3,9'-xanthene] 1,1-dioxide
  • 32638-88-3
  • C19H12O8S
  • 87661
  • Chelating Reagents
  • Bipyridyls, etc. (Chelating Reagents)
  • Analytical Chromatography Product Catalog
  • Metal Titration Indicators
  • Indicators
  • Titration
  • Analytical Chemistry
  • Bipyridyls, etc. (Chelating Reagents)
  • Chelating Reagents