Agent Name

2,4-D isopropyl ester

CAS Number




Major Category



2,4-D esters; 2,4-D, isopropyl ester; 2,4-D-isopropyl; 2,4-Dichlorophenoxyacetic acid, isopropyl ester; Acetic acid, (2,4-dichlorophenoxy)-, 1-methylethyl ester; Acetic acid, (2,4-dichlorophenoxy)-, isopropyl ester; Amchem Weed Killer 650; Barber's Weed Killer (Ester Formulation); Bridgeport Spot Weed Killer; Chemical Insecticide's Isopropyl Ester of 2,4-D Liquid Concentrate; Crop Rider 3-34D-2; Crop Rider 3.34D; Esteron 44; Isopropyl (2,4-dichlorophenoxy)acetate; Isopropyl 2,4-D ester; Isopropylester kyseliny 2,4-dichlorfenoxyoctove [Czech]; Monsanto 2,4-D Isopropyl Ester; Niagara Estasol; Parsons 2,4-D Weed Killer Isopropyl Ester; Swift's Gold Bear 44 Ester; Weedone 128; [ChemIDplus] 2,4-D IPE; [Reference #1]


Herbicides, Chlorophenoxy


Colorless liquid; pure form can be solid; mp = 5-10, 20-25 deg C (two forms); [HSDB] Colorless liquid; mp = 5-10 deg C; [MSDSonline] Pale amber liquid; [Reference #1]


2,4-D and derivatives: Used as herbicide for pastures, rangelands, cereals, corn, rice, nuts, turf, and aquatic, industrial, and commercial areas; [HSDB] Supported by California Citrus Quality Council (CCQC) for selected uses on citrus fruits; [Reference #1]


A skin and eye irritant; The esters of 2,4-D are hydrolyzed rapidly in the body to 2,4-D; Do not accumulate in mammals; Plasma half-life is about 1 day; Analysis of 2,4-D as esters and amine salts in 1982 found the esters more highly contaminated with dioxins; [HSDB] The acid form (2,4-D) is used as representative of the salts and esters due to close similarities in relative toxicities; [Reference #1] See "2,3,7,8-Tetrachlorodibenzo-p-dioxin." See "2,4-D."

Reference Link

EPA Pesticide Chemical Search

Exposure Assessment
Vapor Pressure

0.000232 mm Hg

Lethal Concentration

LC50 (rat) > 4,970 mg/m3

Adverse Effects

Hepatotoxin, Secondary

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

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Industrial Processes with risk of exposure: