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CAS number 94-82-6 YesY
PubChem 1489
ChemSpider 1444 YesY
KEGG C14404 YesY
Jmol-3D images Image 1
Molecular formula C10H10Cl2O3
Molar mass 249.09 g/mol
Appearance Colorless to white crystal
Melting point 117 to 119 °C (243 to 246 °F; 390 to 392 K)
Solubility in water 46 mg/L
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

2,4-DB or 4-(2,4-dichlorophenoxy)butyric acid is a selective systemic phenoxy herbicide used to control many annual and perennial broadleaf weeds in alfalfa, peanuts, soybeans, and other crops. Its active metabolite, 2,4-D, inhibits growth at the tips of stems and roots. It is classified in toxicity class III. It shows some evidence of toxicity to dogs and cats, such as changes in body weight and reduced numbers of offspring, when fed 25-80 milligrams per kilogram of body weight for prolonged periods. Tests of carcinogenicity in this range yielded differing results. It is moderately toxic to fish.[1]


  1. ^ a b "Extension Toxicology Network: Pesticide Information Profiles". Archived from the original on 10 May 2008. Retrieved 15 June 2008.