PHYSICAL CHEMISTRY Mol. wt. 335.3 M.f. C13H16F3N3O4 Form Yellow-orange crystals. M.p. 65-66.5 °C B.p. 121-122 °C/0.5 mmHg; 148-149 °C/7 mmHg V.p. 8.76 mPa (25 °C) Kow logP = 5.29 (20 °C, pH 7) Henry 29.4 Pa m3 mol-1 (25 °C, calc.) S.g./density 1.28 (20 °C) (tech.) Solubility In water 0.1 mg/l (25 °C). In acetone, ethyl acetate, dichloromethane, chloroform >1000, toluene 330-500, acetonitrile 170-200, hexane 18-20, methanol 17-18 (all in g/l, 25 °C). Stability Decomposed by u.v. light. Stable for up to 30 days at pH 5-9 (26 °C). F.p. 151 °C APPLICATIONS Biochemistry Microtubule assembly inhibition. Mode of action Selective soil herbicide, absorbed by the roots. Affects seed germination and prevents weed growth by inhibition of root and shoot development. Uses Control of annual grasses and some annual broad-leaved weeds in peanuts, lettuce, cucumbers, chicory, endive, field beans, french beans, lentils, alfalfa, clovers, trefoil, tobacco and established turf. Applied pre-emergence with soil incorporation, at 1.0-1.5 kg/ha. Formulation types EC; GR; WG.