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2,4-Dichlorophenol structure
Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:

2,4-Dichlorophenol Properties

Melting point:
42-43 °C(lit.)
Boiling point:
209-210 °C(lit.)
vapor pressure 
1.3 hPa (50 °C)
refractive index 
1.4430 (estimate)
Flash point:
237 °F
storage temp. 
methanol: soluble1g in 10ml
pK1:7.85 (25°C)
White to beige
Water Solubility 
4.5 g/L (20 ºC)
Henry's Law Constant
2.88 x 10-6 atm?m3/mol at 20 °C (Sheikheldin et al., 2001) 3.23 x 10-6 atm?m3/mol at 25 °C (estimated, Leuenberger et al., 1985a)
CAS DataBase Reference
120-83-2(CAS DataBase Reference)
EWG's Food Scores
NIST Chemistry Reference
Phenol, 2,4-dichloro-(120-83-2)
EPA Substance Registry System
2,4-Dichlorophenol (120-83-2)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H311+H331-H335-H351-H225-H301+H311+H331-H370-H301-H311-H331-H302-H314-H411-H300-H318-H401
Precautionary statements  P309-P201-P202-P270-P271-P301+P330+P331+P310-P303+P361+P353+P310+P363-P304+P340+P310-P305+P351+P338+P310-P307+P311-P391-P403+P233-P405-P501-P210-P260-P280-P301+P310-P311-P273-P305+P351+P338-P310-P264-P301+P312+P330-P303+P361+P353
Hazard Codes  T,N,F
Risk Statements  22-24-34-51/53-39/23/24/25-23/24/25-11-25
Safety Statements  26-36/37/39-45-61-36/37-16-7
RIDADR  UN 2928 6.1/PG 2
WGK Germany  3
RTECS  SK8575000
HazardClass  6.1
PackingGroup  III
HS Code  29081000
Toxicity Acute oral LD50 for mice 1,276 mg/kg, rats 580 mg/kg (quoted, RTECS, 1985).
NFPA 704
3 0

2,4-Dichlorophenol price More Price(21)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 105953 2,4-Dichlorophenol 99% 120-83-2 5g $14.8 2021-03-22 Buy
Sigma-Aldrich 8.03774 2,4-Dichlorophenol for synthesis 120-83-2 100 g $30.15 2021-03-22 Buy
Sigma-Aldrich 8.03774 2,4-Dichlorophenol for synthesis 120-83-2 500 g $48.28 2021-03-22 Buy
Sigma-Aldrich 07846 2,4-Dichlorophenol certified reference material, TraceCERT 120-83-2 100mg $111 2021-03-22 Buy
Sigma-Aldrich PHR2595 2,4-dichlorophenol Pharmaceutical Secondary Standard; Certified Reference Material 120-83-2 200MG $149 2021-03-22 Buy

2,4-Dichlorophenol Chemical Properties,Uses,Production

Chemical Properties

white to beige crystalline solid

Chemical Properties

2,4-DCP is a colorless crystalline solid with a characteristic odor

Physical properties

Colorless to yellow crystals with a sweet, musty, or medicinal odor. At 40 °C, the average odor threshold concentration and the lowest concentration at which an odor was detected were 29 and 5.4 μg/L, respectively. Similarly, at 25 °C, the average taste threshold concentration and the lowest concentration at which a taste was detected were 2.5 and 0.98 μg/L, respectively (Young et al., 1996).


2,4-Dichlorophenol is a chlorinated derivative of phenol and is used as an intermediate for the preparation of herbicide 2,4-dichlorophenoxyacetic acid (D435680).


Intermediate in production of herbicidal chlorophenoxy acids such as 2,4- dichlorophenoxyacetic acid


ChEBI: A dichlorophenol that is phenol carrying chloro substituents at positions 2 and 4.

Synthesis Reference(s)

Synthetic Communications, 20, p. 2991, 1990 DOI: 10.1080/00397919008051517

General Description

Colorless crystalline solid with a medicinal odor. Melting point 45°C. Sinks in water. Strong irritant to tissues; toxic by ingestion.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

2,4-Dichlorophenol can react vigorously with oxidizing agents. Can also react with acids or acid fumes. Incompatible with acid chlorides and acid anhydrides.

Health Hazard

Tremors, convulsions, shortness of breath, inhibition of respiratory system.

Safety Profile

Suspected carcinogen with experimental carcinogenic and teratogenic data. Poison by intraperitoneal route. Moderately toxic by ingestion and subcutaneous routes. An experimental teratogen. Mutation data reported. Combustible when exposed to heat or flame. Can react vigorously with oxidizing materials. To fight fre, use alcohol foam, foam, CO2, dry chemical. When heated to decomposition, or on contact with acid or acid fumes, it emits hghly toxic fumes of Cl-. See also CHLOROPHENOLS.

Potential Exposure

2,4-Dichlorophenol is a commercially produced substituted phenol used in the manufacture of industrial and agricultural products; in synthesis of pharmaceuticals. As an intermediate in the chemical industry, 2,4-DCP is utilized as the feedstock for the manufacture of 2,4-dichlorophenoxyacetic acid (2,4-D), and 2,4-D derivatives (germicides, soil sterilants, etc.); certain methyl compounds used in mothproofing, antiseptics and seed disinfectants. 2,4-DCP is also reacted with benzene sulfonyl chloride to produce miticides or further chlorinated to pentachlorophenol, a wood preservative. It is thus a widely used pesticide intermediate. The only group expected to be at risk for high exposure to 2,4-DCP is industrial workers involved in the manufacturing or handling of 2,4-DCP and 2,4-D


In mammalian cells in vitro 2,4-DCP produced chromosomal aberrations and induced unscheduled DNA synthesis; it was negative for sister chromatid exchange in vivo and was mostly negative in bacterial assays.
Oral exposure of pregnant rats to 750mg/kg/day for 10 gestational days induced slightly decreased fetal weight, delayed ossification of sternal and vertebral arches, and some early embryonic deaths.10 Maternal deaths also occurred at this dose, indicating that 2,4-DCP was not selectively toxic to embryos or fetuses. No effects were noted in dams or offspring exposed at 375mg/kg/day.
A threshold limit value (TLV) has not been established for 2,4-dichlorophenol.

Environmental Fate

Biological. In activated sludge, 2.8% mineralized to carbon dioxide after 5 d (Freitag et al., 1985). In freshwater lake sediments, anaerobic reductive dechlorination produced 4-chlorophenol (Kohring et al., 1989). Chloroperoxidase, a fungal enzyme isolated from Caldariomyces fumago, converted 9 to 12% of 2,4-dichlorophenol to 2,4,6-trichlorophenol (Wannstedt et al., 1990). When 2,4-dichlorophenol was statically incubated in the dark at 25 °C with yeast extract and settled domestic wastewater inoculum, significant biodegradation with rapid adaptation was observed. At concentrations of 5 and 10 mg/L, 100 and 99% biodegradation, respectively, were observed after 7 d (Tabak et al., 1981). In activated sludge inoculum, 98.0% COD removal was achieved. The average rate of biodegradation was 10.5 mg COD/g?h (Pitter, 1976).
Surface Water. Hoigné and Bader (1983) reported 2,4-dichlorophenol reacts with ozone at a rate constant of <1,500/M?sec at the pH range of 1.5 to 3.0.
Groundwater. Nielsen et al. (1996) studied the degradation of 2,4-dichlorophenol in a shallow, glaciofluvial, unconfined sandy aquifer in Jutland, Denmark. As part of the in situ microcosm study, a cylinder that was open at the bottom and screened at the top was installed through a cased borehole approximately 5 m below grade. Five liters of water was aerated with atmospheric air to ensure aerobic conditions were maintained. Groundwater was analyzed weekly for approximately 3 months to determine 2,4-dichlorophenol concentrations with time. The experimentally determined first-order biodegradation rate constant and corresponding half-life were 0.20/d and 3.47 d, respectively.
Photolytic. In distilled water, photolysis occurs at a slower rate than in estuarine waters containing humic substances. Photolysis products identified in distilled water were the three isomers of chlorocyclopentadienic acid. The following half-lives were reported for 2,4- dichlorophenol in estuarine water exposed to sunlight and microbes: 0.6 and 2.0 h during summer (24 °C) and winter (10 °C), respectively; in distilled water: 0.8 and 3.0 h during summer and winter, respectively; in poisoned estuarine water: 0.7 and 2.0 h during summer and winter, respectively (Hwang et al., 1986). When titanium dioxide suspended in an aqueous solution was irradiated with UV light (λ = 365 nm), 2,4-dichlorophenol was converted to carbon dioxide at a significant rate (Matthews, 1986). An aqueous solution containing hydrogen peroxide and irradiated by UV light (λ = 296 nm) converted 2,4-dichlorophenol to chlorohydroquinone and 1,4- dihydroquinone (Moza et al., 1988). A carbon dioxide yield of 50.4% was achieved when 2,4- dichlorophenol adsorbed on silica gel was irradiated with UV light (λ >290 nm) for 17 h (Freitag et al., 1985).
Chemical/Physical. 2,4-Dichlorophenol will not hydrolyze to any reasonable extent (Kollig, 1993). Reported second-order rate constants for the reaction of 2,4-dichlorophenol and singlet oxygen in water at 292 K: 7 x 106/M?sec at pH 5.5, 2 x 106/M?sec at pH 6, 1.0 x 105/M?sec at pH 6.65, 1.5 x 106/M?sec at pH 7.0, 7.6 x 105/M?sec at pH 7.9, 1.20 x 104/M?sec at pH 9.0 to 9.6. At pH 8, the half-life of 2,4-dichlorophenol is 62 h (Scully and Hoigné, 1987). In an aqueous phosphate buffer at 27 °C, 2,4-dichlorophenol reacted with singlet oxygen at a rate of 5.1 x 106/M?sec (Tratnyek and Hoigné, 1991). At neutral pH, 2,4-dichlorophenol was completely oxidized by potassium permanganate (2.0 mg/L) after 15 min (quoted, Verschueren, 1983).


UN2020 Chlorophenols, solid, Hazard Class: 6.1; Labels: 6.1-Poisonous materials

Purification Methods

Crystallise it from pet ether (b 30-40o). Purify it also by repeated zone melting, using a P2O5 guard tube to exclude moisture. It is very hygroscopic when dry. [Beilstein 6 IV 885.]


Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, and epoxides. Contact with acids or acid fumes causes decomposition releasing poisonous chlorine gas. Incompatible with caustics, acid anhydrides; acid chlorides. Quickly corrodes aluminum; slowly corrodes zinc, tin, brass, bronze, copper and its alloys. May accumulate static electrical charges, and may cause ignition of its vapors.

Waste Disposal

Dissolve in a combustible solvent and incinerate in a furnace equipped with afterburner and scrubber. In accordance with 40CFR165, follow recommendations for the disposal of pesticides and pesticide containers. Must be disposed properly by following package label directions or by contacting your local or federal environmental control agency, or by contacting your regional EPA office. Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≧100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal

2,4-Dichlorophenol Preparation Products And Raw materials

Raw materials

Preparation Products

2,4-Dichlorophenol Suppliers

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View Lastest Price from 2,4-Dichlorophenol manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-12-01 2,4-Dichlorophenol
US $10.70 / Kg/Bag 10g 99% 10000kg Hebei Crovell Biotech Co Ltd
2021-07-28 2,4-Dichlorophenol
US $1.00 / KG 1KG 99% 10 mt Hebei Guanlang Biotechnology Co., Ltd.
2021-07-13 2,4-Dichlorophenol
US $15.00-10.00 / KG 1KG 99%+ HPLC Monthly supply of 1 ton Zhuozhou Wenxi import and Export Co., Ltd

2,4-Dichlorophenol Spectrum

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