Picloram

Details:

Specifications (1)common name:Picloram (2)CAS RN [1918-02-1] (3) M.f. C6H3Cl3N2O2 (4)Composition Tech. is 79.5%. Picloram Chemical Abstracts name 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid M.f. C6H3Cl3N2O2 Mol. wt. 241.5 Composition Tech. is 79.5%. Form Colourless powder, with a chlorine-like odou M.p.Decomposes at c. 215 oC without melting V.p. 8.4 ′ 10-2 mPa (25 °C) KOW logP = 1.9 (20 °C, 0.1N HCl, i.e. neutral species) Henry 4.7 ′ 10-5 Pa m3 mol-1 Solubility In water 430 mg/l (25 oC). In acetone 19.8, ethanol 10.5, isopropanol 5.5, acetonitrile 1.6, diethyl ether 1.2, dichloromethane 0.6, benzene 0.2, carbon disulfide <0.05 (all in g/l, 25 oC). 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) APPLICATIONS Biochemistry Growth regulator. Synthetic auxin mimic (acting like indolylacetic acid). Mode of action Selective systemic herbicide, absorbed rapidly by the roots and leaves, and translocated both acropetally and basipetally, accumulating in new growth. Uses 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. Phytotoxicity Phytotoxic to most broad-leaved crops (except crucifers). Non-phytotoxic to established grasses, but seedling grasses may be susceptible. Formulation types SL. When picloram is formulated as a stand-alone product, it is typically as the potassium salt. When in combination with other active ingredients, picloram is formulated either as an ester or an amine salt.