2,4-Dichlorophenoxyacetic acid
2,4-Dichlorophenoxyacetic acid
2,4-Dichlorophenoxyacetic acid
2,4-Dichlorophenoxyacetic acid (2,4-D) is a systemic herbicide used worldwide for weed control. As one of the oldest and most cost-effective weed killers, it is widely applied in agricultural and landscape applications.
Request a Quote2,4-Dichlorophenoxyacetic acid (2,4-D) is a systemic herbicide used worldwide for weed control. As one of the oldest and most cost-effective weed killers, it is widely applied in agricultural and landscape applications.
CAS No.: 94-75-7
Synonyms: 2,4-D; 2,4-D ACID; 2,4-dichlorophenoxyacetic
Molecular Formula: C8H6Cl2O3
Molecular Weight: 221.04
Melting point |
136–140 °C (lit.) |
Boiling point |
160 °C (0.4 mmHg) |
Density |
1.563 |
Vapor pressure |
0.4 mm Hg (160 °C) |
Refractive index |
1.5000 (estimated) |
Flash point |
160 °C / 0.4 mm |
Storage temperature |
2–8 °C |
Solubility |
Soluble in organic solvents (ethanol, acetone, dioxane) |
pKa |
pK1: 2.64 (25 °C) |
Form |
Crystalline |
Color |
Off-white to tan |
pH range |
Acidic |
Odor threshold |
3.13 ppm |
Water solubility |
Slightly soluble. Decomposes. 0.0890 g/100 mL |
Stability |
Stable, but moisture-sensitive and may be light-sensitive. Incompatible with strong oxidizing agents; corrodes many metals. Decomposes in water. |
GHS symbol(s) |
|
Signal word |
Danger |
Hazard codes |
Xn, Xi, T, F |
RIDADR |
UN 3077 9/PG 3 |
Autoignition temperature |
> 180 °C |
TSCA |
Yes |
Hazard class |
6.1 |
Packing group |
III |
HS code |
29189090 |
As one of the most inexpensive and oldest weed killers, 2,4-Dichlorophenoxyacetic acid (commonly referred to as 2,4-D) is a systemic herbicide widely used worldwide. It is effective for selectively controlling a variety of terrestrial and aquatic broadleaf weeds without significantly affecting most grasses, such as cereals, lawn turf, and grasslands. Today, 2,4-D is widely used to manage unwanted vegetation in various areas. In forestry, it is used for stump treatment, trunk injection, and selective brush control in conifer forests, as well as to kill weeds and brush along roadways, railways, and power lines where vegetation may damage equipment or interfere with safe operation. In addition, it is applied to control aquatic weeds to support the safety of boating, fishing, and swimming, and to protect hydroelectric equipment. It is also used to help control the spread of invasive, noxious, and non-native weed species by government authorities and to manage various poisonous weeds such as poison ivy and poison oak. In addition to forestry applications, 2,4-D can also be used as a supplement in plant cell culture media in laboratories as a dedifferentiation hormone.
