2,4-Dichlorophenoxyacetic acid

2,4-Dichlorophenoxyacetic acid
Names
	Preferred IUPAC name (2,4-Dichlorophenoxy)acetic acid
	Other names 2,4-D
Identifiers
CAS Number	94-75-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:28854 ;
ChEMBL	ChEMBL367623 ;
ChemSpider	1441 ;
ECHA InfoCard	100.002.147
KEGG	C03664 ;
PubChem CID	1486;
UNII	2577AQ9262 ;
CompTox Dashboard (EPA)	DTXSID0020442 ;
	InChI InChI=1S/C8H6Cl2O3/c9-5-1-2-7(6(10)3-5)13-4-8(11)12/h1-3H,4H2,(H,11,12) Key: OVSKIKFHRZPJSS-UHFFFAOYSA-N ; InChI=1/C8H6Cl2O3/c9-5-1-2-7(6(10)3-5)13-4-8(11)12/h1-3H,4H2,(H,11,12) Key: OVSKIKFHRZPJSS-UHFFFAOYAM;
	SMILES Clc1cc(Cl)ccc1OCC(=O)O;
Properties
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
	GHS labelling:
Pictograms
Hazard statements	H302, H317, H318, H335, H412
Precautionary statements	P261, P273, P280, P305+P351+P338
Flash point	nonflammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	500 mg/kg (oral, hamster); 100 mg/kg (oral, dog); 347 mg/kg (oral, mouse); 699 mg/kg (oral, rat);
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 10 mg/m3
REL (Recommended)	TWA 10 mg/m3
IDLH (Immediate danger)	100 mg/m3
Safety data sheet (SDS)	ICSC 0033
Related compounds
Related compounds	2,4,5-T, Dichlorprop
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

2,4-Dichlorophenoxyacetic acid is an organic compound with the chemical formula C₈H₆Cl₂O₃. It is usually referred to by its ISO common name 2,4-D. It is a systemic herbicide that kills most broadleaf weeds by causing uncontrolled growth, but most grasses such as cereals, lawn turf, and grassland are relatively unaffected.

2,4-D is one of the oldest and most widely available herbicides and defoliants in the world, having been commercially available since 1945, and is now produced by many chemical companies since the patent on it has long since expired. It can be found in numerous commercial lawn herbicide mixtures, and is widely used as a weedkiller on cereal crops, pastures, and orchards. Over 1,500 herbicide products contain 2,4-D as an active ingredient.