2,4-Dichlorophenoxyacetic acid (usually referred to by its abbreviation, 2,4-D) is a common systemic herbicide used in the control of broadleaf weeds. It is a synthetic auxin (plant hormone) and one of the most widely used herbicides in the world. Since 2014 genetically modified soybeans and genetically modified maize resistant to 2,4D and glyphosate have been approved in Canada and the U.S. as well as the corresponding herbicide Enlist Duo, which contains 2,4-D choline and glyphosate. 2,4-D was one of the ingredients in Agent Orange, the herbicide widely used during the Vietnam War. According to the US National Pesticide Information Center, "the controversy regarding health effects centered around the2,4,5-T component of the herbicide and its contaminant,
2,4-Dichlorophenoxyacetic acid |
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Names |
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IUPAC name |
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Other names |
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Identifiers |
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CAS Registry Number |
94-75-7 |
Properties |
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Chemical formula |
C8H6Cl2O3 |
Molar mass |
221.04 g/mol |
Appearance |
white to yellow powder |
Melting point |
140.5 °C (284.9 °F; 413.6 K) |
Boiling point |
160 °C (320 °F; 433 K) 0.4 mm Hg |
Solubility in water |
900 mg/L |
Hazards |
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Flash point |
nonflammable |
Lethal dose or concentration (LD, LC): |
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LD50 (Median dose) |
500 mg/kg (oral, hamster)
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