Product Name

  • Name

    Pyrogallol

  • EINECS 211-207-2
  • CAS No. 87-66-1
  • Article Data112
  • CAS DataBase
  • Density 1.488 g/cm3
  • Solubility 400 g/L (25 °C) in water
  • Melting Point 43-47 °C(lit.)
  • Formula C6H6O3
  • Boiling Point 309 °C at 760 mmHg
  • Molecular Weight 126.112
  • Flash Point 164.4 °C
  • Transport Information UN 2811 6.1/PG 3
  • Appearance white crystalline solid
  • Safety 22-24/25-61-36/37
  • Risk Codes 20/21/22-52/53-68-40
  • Molecular Structure Molecular Structure of 87-66-1 (Pyrogallol)
  • Hazard Symbols Xn
  • Synonyms Fourrine PG;NSC 5035;Pyrogallicacid;Pyrogallol (8CI);1,2,3-Trihydroxybenzene;2,3-Dihydroxyphenol;Benzene-1,2,3-triol;C.I. 76515;C.I. Oxidation Base 32;Fouramine Brown AP;Fourrine 85;
  • PSA 60.69000
  • LogP 0.80340

Synthetic route

3,4,5-trihydroxybenzoic acid
149-91-7

3,4,5-trihydroxybenzoic acid

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With cucumber juice at 30 - 35℃; for 48h; Inert atmosphere; Green chemistry;98%
With Citrobacter sp at 28℃; for 24h; enzymatic synthesis by bacterium in a mixed medium containing: 0.5percent maltose, 0.2percent (NH4)2HPO4, 0.1percent KH2PO4, 0.05percent KCl, 0.05percentMgSO4.7H2Oand 0.05percent yeast, pH=4.5;97.4%
With Cocos nucifera juice at 20℃; for 48h; Inert atmosphere;96%
1,2,3-tris((trimethylsilyl)oxy)benzene
17864-23-2

1,2,3-tris((trimethylsilyl)oxy)benzene

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With methanol; 1,3-disulfonic acid imidazolium hydrogen sulfate at 20℃; for 0.133333h; Green chemistry;96%
1,2,3-trimethoxybenzene
634-36-6

1,2,3-trimethoxybenzene

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With aluminium(III) iodide; tetra-(n-butyl)ammonium iodide In benzene for 0.5h; Heating;95%
With aluminum (III) chloride In chloroform for 4h; Solvent; Reflux;80%
2,3-dihydroxybenzaldehyde
24677-78-9

2,3-dihydroxybenzaldehyde

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With dihydrogen peroxide at 20℃; for 0.833333h; Dakin Phenol Oxidation; Green chemistry;95%
With dihydrogen peroxide In water; acetonitrile at 35℃; for 12h; Dakin Phenol Oxidation;72%
1,3-dimethoxy-2-hydroxy-benzene
91-10-1

1,3-dimethoxy-2-hydroxy-benzene

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With hydrogen bromide90%
With cytochrome P450 oxidase; GcoA-F169A reductase; oxygen; NADH; sodium chloride In aq. buffer at 25℃; pH=7.5; Kinetics; Reagent/catalyst; Enzymatic reaction;
hydrogenchloride
7647-01-0

hydrogenchloride

triphenylantimony o-hydroxy-o-phenylenediamine
187221-61-0

triphenylantimony o-hydroxy-o-phenylenediamine

A

triphenylantimony dichloride
594-31-0, 34716-91-1, 20265-29-6

triphenylantimony dichloride

B

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
heating (3 h, water bath); soln. pouring into Petri dish, solid extraction by benzene;A 83%
B 90%
pyrogallol triacetate
525-52-0

pyrogallol triacetate

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With hydrogenchloride In acetic acid87%
1,3-Cyclohexanedione
30182-67-3

1,3-Cyclohexanedione

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With oxygen; tetrabutyl ammonium fluoride In chloroform for 2h; Irradiation;70%
With polymer bound rose bengal; tetrabutyl ammonium fluoride; oxygen In chloroform at 0℃; for 2h; Irradiation;70%
trans-3,5-dimethoxy-4-hydroxycinnamic acid
530-59-6

trans-3,5-dimethoxy-4-hydroxycinnamic acid

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With hydrogenchloride; water at 250℃; under 37503.8 Torr; for 3h; Sealed tube; Inert atmosphere;59%
2,3-dimethoxyphenol
5150-42-5

2,3-dimethoxyphenol

A

3-methocycatechol
934-00-9

3-methocycatechol

B

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With aluminium(III) iodide; dimethyl sulfoxide In acetonitrile at 20℃; for 48h; Time;A 24%
B 50%
With 3,4-Dihydroxybenzoic acid; holo-corrinoid protein reconstructed from recombinant apo-protein and methyl cobalamin; methyl transferase I from Desulfitobacterium hafniense; potassium chloride; potassium hydroxide In dimethyl sulfoxide at 30℃; for 24h; pH=6.5; Solvent; Enzymatic reaction;A 12%
B n/a
2,2,6,6-tetrachlorocyclohexanone
3776-30-5

2,2,6,6-tetrachlorocyclohexanone

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With nitrogen In water46%
With nitrogen; sodium acetate; sodium hydrogencarbonate In water
1,2,3,4-tetrahydroxybenzene
642-96-6

1,2,3,4-tetrahydroxybenzene

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
Stage #1: 1,2,3,4-tetrahydroxybenzene With sodium hydroxide; hydrogen; Rh/Al2O3 at 20℃; under 2585.81 Torr; for 12h;
Stage #2: With sulfuric acid for 12h; Heating; Further stages.;
44%
2,2,6,6-tetrabromo-cyclohexanone
29170-71-6

2,2,6,6-tetrabromo-cyclohexanone

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
44%
phenol
108-95-2

phenol

A

benzene-1,2-diol
120-80-9

benzene-1,2-diol

B

hydroquinone
123-31-9

hydroquinone

C

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With Pseudomonas sp. isolated from coastal waters and soils of the Absheron peninsula at the Caspian Sea In water at 28℃; Microbiological reaction;A 40%
B 10%
C 20%
2-(2,6-dimethoxyphenoxy)-1-[(2R*,3S*)-2-(3,4-dimethoxyphenyl)-3-(hydroxymethyl)-7-methoxy-2,3-dihydro-1-benzofuran-5-yl]propan-1,3-diol

2-(2,6-dimethoxyphenoxy)-1-[(2R*,3S*)-2-(3,4-dimethoxyphenyl)-3-(hydroxymethyl)-7-methoxy-2,3-dihydro-1-benzofuran-5-yl]propan-1,3-diol

A

benzene-1,2-diol
120-80-9

benzene-1,2-diol

B

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With hydrogenchloride In water at 275℃; under 75007.5 Torr; for 3h; Sealed tube; Inert atmosphere;A 7 %Spectr.
B 27%
5-hydroxymethyl-2-furfuraldehyde
67-47-0

5-hydroxymethyl-2-furfuraldehyde

A

furfural
98-01-1

furfural

B

1,2,4-Trihydroxybenzene
533-73-3

1,2,4-Trihydroxybenzene

C

levulinic acid
123-76-2

levulinic acid

D

hydroquinone
123-31-9

hydroquinone

E

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
In water at 330℃; under 210017 Torr; for 0.075h; other temperatures, other reaction times, other educt;A n/a
B 25%
C n/a
D n/a
E n/a
(-)-3-dehydroshikimic acid
2922-42-1

(-)-3-dehydroshikimic acid

A

3,4-Dihydroxybenzoic acid
99-50-3

3,4-Dihydroxybenzoic acid

B

tricarallylic acid
99-14-9

tricarallylic acid

C

3,4,5-trihydroxybenzoic acid
149-91-7

3,4,5-trihydroxybenzoic acid

D

dihydrogallic acid
184105-29-1

dihydrogallic acid

E

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With air; Na1.5H1.5PO4 at 40℃; for 50h; Rate constant; Mechanism; other oxidant, var. time;A 12 % Spectr.
B 14 % Spectr.
C 13%
D n/a
E 3 % Spectr.
syringaresinol
487-35-4

syringaresinol

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With hydrogenchloride In water at 275℃; under 75007.5 Torr; for 3h; Sealed tube; Inert atmosphere;8%
1,2,3-trimethoxybenzene
634-36-6

1,2,3-trimethoxybenzene

aniline hydrochloride
142-04-1

aniline hydrochloride

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
at 200℃;
1,2,3-trimethoxybenzene
634-36-6

1,2,3-trimethoxybenzene

pyridine hydrochloride
628-13-7

pyridine hydrochloride

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
at 200 - 220℃;
2-hydroxy-5-chlorobenzenesulfonic acid
2051-65-2

2-hydroxy-5-chlorobenzenesulfonic acid

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With potassium hydroxide at 180 - 190℃;
Ethyl gallate
831-61-8

Ethyl gallate

A

ethanol
64-17-5

ethanol

B

rufigallol
82-12-2

rufigallol

C

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
at 200 - 250℃; bei der trocknen Destillation;
chebulic acid
84026-83-5

chebulic acid

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
at 320 - 340℃; under 12 Torr; bei der trockenen Destillation;
hematoxylin
17647-60-8

hematoxylin

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
bei der trocknen Destillation;
phenol
108-95-2

phenol

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With water; dihydrogen peroxide; iron(II) sulfate
2,3-trans-3',4',7,8-tetrahydroxyflavan-3-ol
109671-55-8

2,3-trans-3',4',7,8-tetrahydroxyflavan-3-ol

A

3,4-Dihydroxybenzoic acid
99-50-3

3,4-Dihydroxybenzoic acid

B

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
alkali fusion;
protonated cycloheptaamylose

protonated cycloheptaamylose

A

1,2,4-Trihydroxybenzene
533-73-3

1,2,4-Trihydroxybenzene

C

acetic acid
64-19-7

acetic acid

D

Glycolaldehyde
141-46-8

Glycolaldehyde

E

hydroxy-2-propanone
116-09-6

hydroxy-2-propanone

F

2-hydroxyresorcinol
87-66-1

2-hydroxyresorcinol

Conditions
ConditionsYield
With sodium chloride at 300℃; under 2 Torr; for 1h; Product distribution; other temperatures, other reaction times, or without 1percent aq. NaCl;A 1.1 % Chromat.
B n/a
C 3.7 % Spectr.
D 12.8 % Spectr.
E 1.6 % Spectr.
F 0.4 % Chromat.

Pyrogallol Chemical Properties

Molecular structure of Pyrogallol (CAS NO.87-66-1) is:

Product Name: Pyrogallol
CAS Registry Number: 87-66-1
IUPAC Name: benzene-1,2,3-triol
Molecular Weight :126.11004 [g/mol]
Molecular Formula: C6H6O3
XLogP3: 0.5
H-Bond Donor: 3
H-Bond Acceptor: 3 
EINECS: 211-207-2
Melting Point: 43-47 °C(lit.)
Surface Tension: 78.6 dyne/cm
Density: 1.488 g/cm3
Flash Point: 164.4 °C
Enthalpy of Vaporization: 57.17 kJ/mol
Boiling Point: 309 °C at 760 mmHg
Vapour Pressure: 0.000361 mmHg at 25 °C
Refractive index: n20/D 1.387
Water Solubility: 400 g/L (25 °C)
Sensitive: Light Sensitive
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. 
Product Categories: FINE Chemical & INTERMEDIATES;Aromatic Hydrocarbons (substituted) & Derivatives

Pyrogallol Uses

 Pyrogallol (CAS NO.87-66-1) can be used in hair dying, dying of suturing materials and for oxygen absorption in gas analysis. but pyrogallol is not likely to be used as a modern hair dye due to the suspected toxicity of the compound.It also has antiseptic properties. It was also used as a developing agent in black-and-white developers, but its use is largely historical except for special purpose applications. When in alkaline solution, it absorbs oxygen from the air, turning purple from a colourless solution. It can be used in this way to calculate the amount of oxygen in air.

Pyrogallol Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
bird - wild LD50 oral 75mg/kg (75mg/kg)   Archives of Environmental Contamination and Toxicology. Vol. 12, Pg. 355, 1983.
dog LDLo intravenous 80mg/kg (80mg/kg)   "Handbook of Toxicology," 4 vols., Philadelphia, W.B. Saunders Co., 1956-59Vol. 1, Pg. 254, 1955.
dog LDLo oral 25mg/kg (25mg/kg)   "Handbook of Toxicology," 4 vols., Philadelphia, W.B. Saunders Co., 1956-59Vol. 1, Pg. 254, 1955.
dog LDLo subcutaneous 300mg/kg (300mg/kg)   "Handbook of Toxicology," 4 vols., Philadelphia, W.B. Saunders Co., 1956-59Vol. 1, Pg. 254, 1955.
frog LDLo subcutaneous 200mg/kg (200mg/kg) SENSE ORGANS AND SPECIAL SENSES: MIOSIS (PUPILLARY CONSTRICTION): EYE

BEHAVIORAL: MUSCLE WEAKNESS

BEHAVIORAL: ATAXIA
Revue Medicale de la Suisse Romande. Vol. 15, Pg. 561, 1895.
human LDLo oral 28mg/kg (28mg/kg) BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: DYSPNEA

GASTROINTESTINAL: OTHER CHANGES
"Toxicology of Drugs and Chemicals," Deichmann, W.B., New York, Academic Press, Inc., 1969Vol. -, Pg. 507, 1969.
man LDLo subcutaneous 120mg/kg (120mg/kg) BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

BEHAVIORAL: EXCITEMENT

GASTROINTESTINAL: CHANGES IN STRUCTURE OR FUNCTION OF SALIVARY GLANDS
Znetralbaltt fuer die Medizinischen Wissenschaften. Vol. 19, Pg. 545, 1881.
mouse LD50 intraperitoneal 400mg/kg (400mg/kg)   National Technical Information Service. Vol. AD691-490,
mouse LD50 oral 300mg/kg (300mg/kg)   Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 38(8), Pg. 6, 1973.
mouse LD50 subcutaneous 566mg/kg (566mg/kg)   Zeitschrift fuer die Gesamte Innere Medizin und Ihre Grenzgebiete. Vol. 2, Pg. 333, 1947.
rabbit LD50 oral 1600mg/kg (1600mg/kg) GASTROINTESTINAL: GASTRITIS

LUNGS, THORAX, OR RESPIRATION: CHRONIC PULMONARY EDEMA
American Journal of Veterinary Research. Vol. 23, Pg. 1264, 1962.
rabbit LDLo subcutaneous 1gm/kg (1000mg/kg)   "Abdernalden's Handbuch der Biologischen Arbeitsmethoden." Vol. 4, Pg. 1289, 1935.
rat LDLo subcutaneous 650mg/kg (650mg/kg)   Journal of Agricultural and Food Chemistry. Vol. 17, Pg. 497, 1969.

Pyrogallol Safety Profile

Hazard Codes: HarmfulXn
Risk Statements: 20/21/22-52/53-68-40 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R68:Possible risk of irreversible effects. 
R40:Limited evidence of a carcinogenic effect.
Safety Statements: 22-24/25-61-36/37 
S22:Do not breathe dust. 
S24/25:Avoid contact with skin and eyes. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S36/37:Wear suitable protective clothing and gloves.
RIDADR: UN 2811 6.1/PG 3
WGK Germany: 3
RTECS: UX2800000
F: 8
HazardClass: 6.1
PackingGroup: III

Pyrogallol Specification

 Pyrogallol , its cas register number is 87-66-1. It also can be called 1,2,3-Benzenetriol ; 1,2,3-Trihydroxybenzene ; C.I. 76515 .It is a odorless white to gray solid. It sinks and mixes with water. Its reactions turns gray on exposure to light or air.

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