2,4-DB

2,4-DB or 4-(2,4-dichlorophenoxy)butyric acid is a selective systemic phenoxy herbicide used to control many annual and perennial broad-leaf 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]

2,4-DB[1][2]
Names
IUPAC name
4-(2,4-dichlorophenoxy)butanoic acid
Other names
  • (2,4-Dichlorophenoxy)butyric acid
  • Butirex
  • Butyrac
  • Embutone
  • Embutox
  • Venceweed
Identifiers
3D model (JSmol)
1976809
ChEBI
ChemSpider
ECHA InfoCard 100.002.152
KEGG
RTECS number
  • ES9100000
UNII
UN number 3082
Properties
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)
46 mg/L
Hazards
Main hazards Persistent hazard to marine life.
Safety data sheet Sigma-Aldrich Site
GHS pictograms
GHS Signal word Warning
H302, H401, H411[2]
P264, P270, P273, P301+312, P330, P391, P501[2]
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g. sodium chlorideReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
0
0
Lethal dose or concentration (LD, LC):
1.97 mg/L - 96.0 h (Rainbow Trout)[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

References
  1. "Extension Toxicology Network: Pesticide Information Profiles". Archived from the original on 10 May 2008. Retrieved 15 June 2008.
  2. "2,4-DB SDS". Sigma-Aldrich. Sigma Aldrich. Retrieved 14 May 2018.
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