Picloram
NOMENCLATURE
Common name Picloram
IUPAC name 4-amino-3,5,6-trichloropyridine-2-carboxylic acid; 4-amino-3,5,6-trichloropicolinic acid
Chemical Abstracts name 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid
CAS RN 1918-02-1
EEC no.
CONTROL OBJECT
Crop
Control object
PHYSICAL CHEMISTRY

Composition Tech. is 77.9%. 

Mol. wt. 241.5 

M.f. C6H3Cl3N2O2 

Form Light brown solid, with a chlorine-like odour. 

M.p. Decomposes at c. 190 ºC before melting 

V.p. 8×10-11 mPa (25 °C) 

KOW logP = 1.9 (20 °C, 0.1N HCl, i.e. neutral species) 

S.g./density Bulk density 0.895 (25 °C)  

Solubility In water 0.056 g/100 ml (20 °C); pH of saturated water solution 3.0 (24.5 °C). In hexane <0.004, toluene 0.013, acetone 1.82, methanol 2.32 (all in g/100 ml, 20 °C)..  

Stability Very stable to acids and alkalis, but decomposed by hot concentrated alkalis. Readily forms water-soluble alkali-metal and amine salts. In aqueous solution, decomposed by u.v. irradiation, DT50 2.6 d (25 ºC). 

pKa 2.3 (22 ºC)

APPLICATIONGS
Growth regulator. Synthetic auxin mimic (acting like indolylacetic acid). Biochemistry
Selective systemic herbicide, absorbed rapidly by the roots and leaves, and translocated both acropetally and basipetally, accumulating in new growth. Mode of action
The main use of picloram salts and esters is for the management of unwanted vegetation in rangeland, grass pastures, forestry, as well as non-crop land and rights-of-way sites such as around industrial and military installations, roads, railways, airports, under powerlines and along pipelines. In some countries, there are additional uses in rice, sugar cane, cereals and oilseed rape. Uses
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