Structural Formula Vector Image
Title: MCPA
CAS Registry Number: 94-74-6
CAS Name: (4-Chloro-2-methylphenoxy)acetic acid
Additional Names: (4-chloro-o-toloxy)acetic acid; 2-methyl-4-chlorophenoxyacetic acid; MCP
Trademarks: Agritox (Nufarm); Agroxone (Zeneca); Cornox (Boots); Methoxone (Zeneca)
Molecular Formula: C9H9ClO3
Molecular Weight: 200.62
Percent Composition: C 53.88%, H 4.52%, Cl 17.67%, O 23.92%
Literature References: Prepn: Synerholm, Zimmerman, Contrib. Boyce Thompson Inst. 14, 91 (1945); Templeman, Sexton, Proc. Roy. Soc. 133B, 300 (1946); Foster, GB 573479 and GB 573510 (both 1945 to ICI); Skeeters, US 2740810 (1956 to Diamond Alkali). Toxicity study: Rowe, Hymas, Am. J. Vet. Res. 15, 622 (1954). Review of carcinogenic risk: IARC Monographs 30, 255-269 (1983); of genotoxicity studies: B. Elliott, Mutagenesis 20, 3-13 (2005).
Properties: Plates from benzene, mp 120°. Practically insol in water. LD50 orally in rats: 700 mg/kg (Rowe, Hymas).
Melting point: mp 120°
Toxicity data: LD50 orally in rats: 700 mg/kg (Rowe, Hymas)
Derivative Type: Sodium salt
CAS Registry Number: 3653-48-3
Trademarks: Chiptox (Rh>e-Poulenc)
Molecular Formula: C9H8ClNaO3
Molecular Weight: 222.60
Percent Composition: C 48.56%, H 3.62%, Cl 15.93%, Na 10.33%, O 21.56%
Properties: Very sol in water.
Use: Herbicide.

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