Clopyralid

Clopyralid[1]
IUPAC name 3,6-Dichloro-2-pyridinecarboxylic acid
Other names 3,6-Dichloropicolinic acid
Identifiers
Abbreviations	3,6-DCP
CAS number	1702-17-6
KEGG	C18779 Y
Jmol-3D images	Image 1
SMILES O=C(O)C1=C(Cl)C=CC(Cl)=N1
Properties
Molecular formula	C6H3Cl2NO2
Molar mass	192.00
Appearance	White crystalline solid
Melting point	150-152 °C
Solubility in water	~1000 ppm
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) is a selective herbicide used for control of broadleaf weeds, especially thistles and clovers.

Clopyralid is in the pyridine family of herbicides, which also includes picloram, triclopyr, and several less common herbicides. For control of Creeping Thistle, Cirsium arvense, a noxious, perennial weed, clopyralid is one of the few effective herbicides available. It is particularly active on members of the Asteraceae and the Fabaceae. It does not affect members of the Poaceae (grasses).

Clopyralid is notorious for its ability to persist in dead plants and compost, and has accumulated to phytotoxic levels in finished compost in a few highly publicized cases. In Seattle, Washington, clopyralid was widely used for weed control in lawns until prohibited in 1999. There, a city-mandated curbside grass clipping collection and composting program produced compost with measurable levels of clopyralid. Subsequently, DowAgro, the manufacturer of clopyralid, voluntarily deregistered it for lawn uses.

Clopyralid is licensed for lawn use in France and under the following names: Bayer Jardin: Désherbant jeune gazon and Scanner Sélectif gazon Vilmorin: désherbant Gazon LONPAR. Brand names of clopyralid in the US market include Stinger, Transline, Reclaim.^[2]

See also

• Aminopyralid

References

1. ^ Merck Index, 11th Edition, 2398.
2. ^ http://www.weedscience.com/summary/ChemFamilySum.asp?lstActive=&btnSub1=Go&lstHRAC=24&btnSub2=Go

External links

• Clopyralid data sheet