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Skeletal formula of MCPB
Ball-and-stick model of the MCPB molecule
IUPAC name
4-(4-Chloro-2-methylphenoxy)butanoic acid
94-81-5 YesY
ChemSpider 6938 N
Jmol-3D images Image
PubChem 7207
Molar mass 228.67 g/mol
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N verify (what isYesY/N?)
Infobox references

MCPB, 2,4-MCPB, 4-(4-chloro-o-tolyloxy)butyric acid (IUPAC), or 4-(4-chloro-2-methylphenoxy)butanoic acid (CAS) is a phenoxybutyric herbicide. In the United States it is registered for use on pea crops before flowering, for post-emergence control of broadleaf annual and perennial weeds including Canadian thistle, buttercup, mustard, purslane, ragweed, common lambsquarters, pigweed, smartweed, sowthistle, and morning glory. It has low to moderate acute toxicity, with kidney and liver effects as the main hazard concerns. It is not volatile, persistent, or likely to bioconcentrate. The maximum residue permitted on peas is 0.1 parts per million.[1]


  1. ^ "RED FACTS; MCPB". US EPA. 

External Links[edit]

  • MCPB in the Pesticide Properties DataBase (PPDB)