2,4-dichlorophenol

C6H4Cl2O

CAS120-83-2
GHS06 Gefahrensymbol: Giftig – Totenkopf mit Knochen
GHS05 Gefahrensymbol: Ätzend – Ätzwirkung
GHS09 Gefahrensymbol: Umweltgefährlich – Umwelt
Danger

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Identification

CAS Number
120-83-2
EC Number
204-429-6
UN Number
2923
Index Number
604-011-00-7
PubChem CID
8449

Physical-chemical properties

Molecular Formula
C6H4Cl2O
Molar Mass
163.00 g/mol
IUPAC Name
2,4-dichlorophenol

Chemical Identifiers

InChI
InChI=1S/C6H4Cl2O/c7-4-1-2-6(9)5(8)3-4/h1-3,9H
InChI Key
HFZWRUODUSTPEG-UHFFFAOYSA-N

Overview

2,4-dichlorophenol (CAS 120-83-2) is a chlorinated phenolic compound with antimicrobial properties and corrosive characteristics. This organochlorine derivative belongs to the family of halogenated phenols and serves as an important intermediate in chemical synthesis and industrial applications. With its molecular formula C6H4Cl2O and molecular weight of 163 g/mol, 2,4-dichlorophenol features two chlorine atoms positioned at the 2 and 4 positions on the phenol ring, giving it distinct chemical reactivity and biological activity. The compound presents significant safety considerations, classified under multiple hazard categories including acute toxicity, skin corrosion, and aquatic chronic toxicity. Its classification as Acute Tox. 3 and 4, along with Skin Corr. 1B designation, requires careful handling with appropriate personal protective equipment and safety protocols. The "Danger" signal word and associated GHS pictogrammes (GHS06, GHS05, GHS09) emphasize the need for professional expertise in its handling and storage. Transportation falls under ADR Class 8, reflecting its corrosive nature. Industrially, 2,4-dichlorophenol finds primary applications as a chemical intermediate in pesticide manufacturing, particularly in the synthesis of herbicides and fungicides. It also serves as a precursor in pharmaceutical synthesis and as a disinfectant agent in specialized applications. The compound shares certain applications with related chlorinated compounds, though it differs significantly from substances like 2-chloro-5-(chloromethyl)-1,3-thiazole in terms of structural framework and specific uses. OYSI maintains reliable supply chains for 2,4-dichlorophenol, ensuring consistent availability for European industrial customers requiring this specialized chemical intermediate.

Safety & Classification

Danger
Classification:

Acute Tox. 3 *; Acute Tox. 4 *; Skin Corr. 1B; Aquatic Chronic 2

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H311

Toxic in contact with skin.

H302

Harmful if swallowed.

H314

Causes severe skin burns and eye damage.

H411

Toxic to aquatic life with long lasting effects.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Skin Contact

Toxic

Measures if substance contacts the skin

First Aid Actions

  • +P302IF ON SKIN:
  • +P352Wash with plenty of water.
  • +P361Take off immediately all contaminated clothing.
  • +P313Get medical advice/attention.

Related hazard statements:

Eye Contact

Harmful

Measures if substance gets into the eyes

First Aid Actions

  • +P305IF IN EYES:
  • +P351Rinse cautiously with water for several minutes.
  • +P338Remove contact lenses, if present and easy to do. Continue rinsing.
  • +P313Get medical advice/attention.

Related hazard statements:

Ingestion

Harmful

Measures if substance is accidentally swallowed

First Aid Actions

  • +P301IF SWALLOWED:
  • +P330Rinse mouth.
  • +P331Do NOT induce vomiting.
  • +P310Immediately call a POISON CENTER/doctor.

Related hazard statements:

General Measures

Emergency 112 | Poison Control: +49 30 19240 (DE), +33 1 45 42 59 59 (FR), +31 30 274 88 88 (NL)

First aid measures are based on CLP classification and associated P-statements. They do not replace the Safety Data Sheet (SDS). In case of emergency, always consult the full SDS and a physician.

Transport (ADR)

UN Number2923
ADR Class8
Packing GroupII
Tunnel CodeE
Proper Shipping Name2,4-Dichlorphenol, flüssig*
Marine PollutantNo

Frequently Asked Questions

What is 2,4-dichlorophenol?

2,4-dichlorophenol is an organochlorine compound with the molecular formula C6H4Cl2O and CAS number 120-83-2. This chemical substance belongs to the phenol family and contains two chlorine atoms positioned at the 2nd and 4th carbon atoms of the benzene ring. With a molecular weight of 163 g/mol, it is classified as a hazardous chemical with corrosive and toxic properties, requiring careful handling in industrial applications.

What are the physicochemical properties of 2,4-dichlorophenol?

2,4-dichlorophenol is typically a white to pale yellow crystalline solid at room temperature with a characteristic phenolic odor. It has moderate solubility in water and is more soluble in organic solvents like alcohol and ether. The compound has a melting point around 45°C and is volatile at elevated temperatures. Its chemical structure makes it relatively stable under normal conditions but reactive towards strong bases and oxidizing agents.

What is 2,4-dichlorophenol used for?

2,4-dichlorophenol is primarily used as an intermediate in the production of herbicides, particularly 2,4-D (2,4-dichlorophenoxyacetic acid). It serves as a precursor in pharmaceutical synthesis and as a disinfectant in some industrial applications. The compound is also utilized in the manufacturing of dyes, preservatives, and other chlorinated organic compounds. Its antimicrobial properties make it suitable for certain specialized industrial preservation applications.

How to handle 2,4-dichlorophenol safely?

2,4-dichlorophenol requires strict safety measures due to its corrosive and toxic nature. Always wear chemical-resistant gloves, safety goggles, and protective clothing when handling. Work in well-ventilated areas or under fume hoods to avoid inhalation exposure. Use appropriate respiratory protection when necessary. Avoid skin and eye contact completely, as the substance can cause severe burns. Handle containers carefully to prevent spills and ensure proper grounding when transferring materials.

How to store 2,4-dichlorophenol correctly?

2,4-dichlorophenol should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat sources and direct sunlight. Keep away from incompatible materials such as strong bases, oxidizing agents, and metals. Store in areas with appropriate temperature control and spill containment systems. Ensure storage areas are equipped with proper ventilation and emergency equipment. Regularly inspect containers for signs of deterioration or leakage.

What to do in case of contact with 2,4-dichlorophenol?

In case of skin contact with 2,4-dichlorophenol, immediately remove contaminated clothing and flush the affected area with plenty of water for at least 15 minutes. For eye contact, rinse thoroughly with water for at least 15 minutes and seek immediate medical attention. If inhaled, move the person to fresh air immediately. In case of ingestion, do not induce vomiting and seek medical attention immediately. Always consult a physician for any exposure incident.

How to dispose of 2,4-dichlorophenol appropriately?

2,4-dichlorophenol waste must be disposed of according to local, national, and international hazardous waste regulations. The substance cannot be disposed of in regular waste streams due to its toxic and corrosive properties. Contact licensed hazardous waste disposal companies for proper treatment and disposal. Incineration at high temperatures in specialized facilities is typically required. Always consult local environmental authorities for specific disposal requirements and maintain proper documentation of waste disposal activities.

How to transport 2,4-dichlorophenol?

2,4-dichlorophenol is classified as ADR Class 8 (corrosive substances), Packing Group II, indicating it requires special transportation procedures. Packages must meet UN specification requirements and be properly labeled with appropriate hazard labels and markings. Transport vehicles must carry proper documentation including safety data sheets and emergency response information. Drivers must have appropriate hazardous materials training. Ensure compliance with all applicable transportation regulations for corrosive materials.

Is 2,4-dichlorophenol subject to specific regulations?

2,4-dichlorophenol is subject to various chemical regulations including REACH registration requirements in Europe and CLP classification as a hazardous substance. It is not currently listed as a Substance of Very High Concern (SVHC) under REACH. The compound must be handled according to occupational health and safety regulations, and its use may be restricted in certain applications. Companies must comply with notification requirements and maintain safety data sheets for workplace safety and regulatory compliance.

Where to buy 2,4-dichlorophenol in Europe?

2,4-dichlorophenol is available through OYSI, a specialized European distributor of technical chemicals. As an established chemical supplier, OYSI provides quality chemicals with proper documentation, safety data sheets, and regulatory compliance support. Professional customers can contact OYSI for availability, specifications, and ordering information. The company ensures proper packaging, labeling, and transportation according to ADR requirements for safe delivery across European markets.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.