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 and preservative properties. This halogenated aromatic compound represents an important intermediate in chemical synthesis and industrial applications. As a member of the chlorophenol family, 2,4-dichlorophenol exhibits enhanced chemical stability and biological activity compared to its non-chlorinated counterparts. The presence of two chlorine atoms at positions 2 and 4 on the phenol ring significantly influences its physical properties, including increased lipophilicity and resistance to biodegradation. The substance appears as a white to pale yellow crystalline solid with a characteristic phenolic odor. Its molecular structure, with the formula C6H4Cl2O and molecular weight of 163 g/mol, makes it soluble in organic solvents while maintaining limited water solubility. The compound's chemical behavior is typical of substituted phenols, participating in electrophilic aromatic substitution reactions and forming stable derivatives. From a safety perspective, 2,4-dichlorophenol requires careful handling due to its classification as Acute Tox. 3 and 4, along with Skin Corr. 1B properties. The substance carries the "Danger" signal word and displays GHS06, GHS05, and GHS09 pictograms, indicating acute toxicity, corrosivity, and environmental hazards. Its ADR Class 8 classification reflects its corrosive nature during transport. Industrial applications include its use as an antimicrobial agent, chemical intermediate in pesticide synthesis, and component in wood preservation formulations. Like other halogenated compounds such as 2-chloro-5-(chloromethyl)-1,3-thiazole, it serves specialized roles in pharmaceutical and agrochemical industries. OYSI maintains reliable supply chains for 2,4-dichlorophenol to support diverse industrial requirements across European markets.

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 chlorophenol family, characterized by two chlorine atoms attached to a phenol ring at the 2 and 4 positions. With a molecular weight of 163 g/mol, it is classified as a hazardous substance 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 readily soluble in organic solvents such as alcohols and ethers. The compound exhibits corrosive properties and can cause severe skin burns and eye damage. 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 serves primarily as an intermediate in the synthesis of herbicides, particularly 2,4-dichlorophenoxyacetic acid (2,4-D). It is also used in the production of other pesticides, antiseptics, and preservatives. Additionally, this compound finds applications in the manufacturing of dyes, pharmaceuticals, and as a chemical intermediate in various organic synthesis processes within the chemical industry.

How to handle 2,4-dichlorophenol safely?

2,4-dichlorophenol requires strict safety measures due to its corrosive and toxic nature. Essential personal protective equipment includes chemical-resistant gloves, safety goggles, face shields, and protective clothing. Work should be conducted in well-ventilated areas or under fume hoods to prevent inhalation exposure. Avoid direct skin and eye contact, and ensure emergency shower and eyewash stations are readily accessible during handling operations.

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 containers in secondary containment to prevent spills and maintain storage temperatures below 25°C. Store separately from strong bases, oxidizing agents, and incompatible materials. Ensure storage areas are equipped with appropriate spill control measures and are accessible only to trained personnel.

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

Immediate action is crucial due to the corrosive nature of 2,4-dichlorophenol. For skin contact, remove contaminated clothing and rinse affected area with plenty of water for at least 15 minutes. In case of eye contact, flush immediately with water for 15-20 minutes and remove contact lenses if present. If inhaled, move to fresh air immediately. Seek immediate medical attention for all exposure routes and provide safety data sheet to medical personnel.

How to dispose of 2,4-dichlorophenol appropriately?

2,4-dichlorophenol disposal must comply with local and international hazardous waste regulations due to its toxic and environmentally harmful properties. The substance should never be discharged to sewers or the environment. Disposal must be carried out by licensed hazardous waste contractors through approved methods such as high-temperature incineration or specialized chemical treatment facilities. Maintain proper documentation of all disposal activities as required by regulations.

How to transport 2,4-dichlorophenol?

2,4-dichlorophenol is classified as ADR Class 8 (corrosive substances), Packing Group II, requiring specialized transport procedures. Packages must be properly labeled with appropriate hazard pictogrammes and comply with ADR packaging requirements. Transport vehicles must carry appropriate emergency equipment and documentation. Only trained personnel should handle transportation, and specific routing restrictions may apply depending on local regulations and quantities transported.

Is 2,4-dichlorophenol subject to specific regulations?

2,4-dichlorophenol is subject to comprehensive chemical regulations including REACH registration requirements in the European Union and CLP classification obligations. The substance is classified with multiple hazard categories including acute toxicity, skin corrosion, and aquatic toxicity. Users must comply with safety data sheet requirements, workplace exposure limits, and environmental discharge restrictions. Regular monitoring and reporting may be required depending on usage quantities and applications.

Where to buy 2,4-dichlorophenol in Europe?

2,4-dichlorophenol is available through OYSI, a specialized European distributor of technical chemicals and industrial raw materials. OYSI provides high-quality 2,4-dichlorophenol with complete regulatory documentation, safety data sheets, and technical support for industrial customers across Europe. Their experienced team ensures proper handling, packaging, and delivery compliance with all applicable transportation and safety regulations for professional users.

Data Sources

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