Structural Formula Vector Image
Title: 2,4,5-T
CAS Registry Number: 93-76-5
CAS Name: (2,4,5-Trichlorophenoxy)acetic acid
Trademarks: Esteron 245 (Dow); Trioxone (Zeneca)
Molecular Formula: C8H5Cl3O3
Molecular Weight: 255.48
Percent Composition: C 37.61%, H 1.97%, Cl 41.63%, O 18.79%
Literature References: Post-emergence herbicide. Prepd from 2,4,5-trichlorophenol: Pokorny, J. Am. Chem. Soc. 63, 1768 (1941); from benzenehexachloride: Galat, ibid. 74, 3890 (1952). Activity: C. L. Hamner, T. B. Tukey, Science 100, 154 (1944). Contains trace levels of TCDD, q.v., as a contaminant: J. Smith, Science 203, 1090 (1979); Chem. Eng. News 59, 6 (Jan. 5, 1981). Toxicity: V. A. Rowe, T. A. Hymas, Am. J. Vet. Res. 15, 622 (1954). See also 2,4-D.
Properties: Crystals from benzene, mp 153°. d2020 1.80. Soly in water at 30°: 238 mg/kg. Sol in alcohol. Forms water-soluble sodium and alkanolamine salts. Commercial products are usually in the form of amines or esters, often in mixture with 2,4-D. LD50 orally in mice, rats: 389, 500 mg/kg (Rowe, Hymas).
Melting point: mp 153°
Density: d2020 1.80
Toxicity data: LD50 orally in mice, rats: 389, 500 mg/kg (Rowe, Hymas)
CAUTION: Potential symptoms of overexposure in exptl animals are ataxia; skin irritation, acne-like rash; liver damage. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 292.
NOTE: In March 1985 the E.P.A. terminated all registrations for the use of this herbicide on rice fields, orchards, sugarcane, rangeland and other noncrop sites. This follows the 1970 action of the Department of Agriculture halting the use of the pesticide on all food crops except rice: Chem. Eng. News 63, 6 (Mar. 25, 1985).
Use: Formerly as herbicide.

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