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  • Catechol
  • Catechol

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Catechol

Catechol

Basic Information

CAS No.: 120-80-9
Molecular Formula: C6H6O2
Molecular weight: 110.11

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Product Details

Catechol is a white crystalline solid.  Turnsbrown on contact with light and air.  Molecularweight=110.12;  Specific gravity (H2O:1)=1.3;  Boilingpoint=245.5℃;  Freezing/Melting point=104℃.  It sublimes readily;  Vapor pressure=10 mmHg at 117℃;  Flashpoint=127℃;  Autoignition temperature=512℃. Explosive Limits in air: LEL=1.4%;  UEL-Unknown. Hazard Identification (based on NFPA 704 M RatingSystem): Health 3, Flammability 1, Reactivity 2.  Solubilityin water=44%.


Chemical Properties
PropertyValue

Melting point

100-103 °C (lit.)

Boiling point

245 °C (lit.)

Density

1,371 g/cm3

Vapor density

3.8 (vs air)

Vapor pressure

1 mm Hg ( 75 °C)

Refractive index

1.6120 (estimate)

Fp

279 °F

Storage temp.

Store below +30°C.

Solubility

430g/l

Pka

9.85(at 20℃)

Form

Crystalline Flakes

Color

white to faintly beige

PH

6 (100g/l, H2O, 20℃)

Explosive limit

1.97%(V)

Biological source

Synthetic (organic)

Water Solubility

430 g/L (20 ºC)

Sensitive

Air & Light Sensitive

Merck

14,7999

BRN

471401

Exposure limits

TLV-TWA 5 ppm (～22 mg/m3) (ACGIH). .

Stability

Stable. Substances to be avoided include acid chlorides, acid anhydrides, bases, oxidizing agents, nitric acid. Light sensitive; may discolour on exposure to air. Combustible.

LogP

0.93

CAS DataBase Reference

120-80-9(CAS DataBase Reference)

NIST Chemistry Reference

1,2-Benzenediol(120-80-9)

IARC

2B (Vol. 15, Sup 7, 71) 1999

EPA Substance Registry System

Catechol (120-80-9)


Safety Information

PropertyValue
Hazard symbolXn
Hazard class codes21/22-36/38-68-43
Safety descriptions22-26-37-39
UN dangerous goods numberUN 2811 6.1/PG 3
Occupational exposure classA
Occupational exposure limitTWA: 5 ppm (20 mg/m³) [skin]
WGK Germany2
RTECS numberUX1050000
TSCATSCA listed
HS code2907 29 00
Hazard class6.1
Packing groupIII
Storage class6.1C - Combustible, acute toxicity Category 3
Toxic compounds or compounds causing chronic effects
Hazard class (category)Acute toxicity, Category 3, Dermal
Acute toxicity, Category 3, Oral
Carcinogenicity, Category 1B
Serious eye damage, Category 1
Germ cell mutagenicity, Category 2
Skin irritation, Category 2
Skin sensitization, Category 1
Hazardous substances data120-80-9 (Hazardous Substances Data)
ToxicityLD50 in mice (mg/kg): 260 orally; 190 i.p. (Lehman)


Product Usage

Catechol is a critical organic compound and a versatile building block extensively used in the fine chemical and pharmaceutical industries. Its most prominent application is as a key intermediate in the synthesis of life-saving drugs, including catecholamines like adrenaline, dopamine, and L-dopa, which are essential for treating neurological and cardiovascular conditions. In the agrochemical sector, it serves as a fundamental precursor for manufacturing high-efficiency insecticides and carbamate pesticides. Beyond life sciences, Catechol is vital in the flavor and fragrance industry for producing vanillin and ethylvanillin. Furthermore, its unique antioxidant and metal-chelating properties make it an indispensable additive in industrial applications, such as rubber vulcanization accelerators, polymerization inhibitors, and specialized photographic developing agents.

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