New Herbicide - pyridate

NOMENCLATURE
Common name pyridate (BSI, E-ISO, (m) F-ISO, WSSA)
IUPAC name 6-chloro-3-phenylpyridazin-4-yl S-octyl thiocarbonate
Chemical Abstracts name O-(6-chloro-3-phenyl-4-pyridazinyl) S-octyl carbonothioate
CAS RN [55512-33-9]
EEC no. 259-686-7

PHYSICAL CHEMISTRY
Mol. wt. 378.9
M.f. C19H23ClN2O2S
Form Colourless crystals; (tech., brown, oily liquid).
M.p. 27 ºC; (tech., 20-25 ºC)
B.p. 220 ºC/0.1 mmHg (tech.)
V.p. 4.8 *10-4 mPa (20 ºC) (tech.)
KOW logP = 4.01
Henry 1.21 *10-4 Pa m3 mol-1 (20 °C) (calc.)
S.g./density 1.16 (20 ºC) (tech.)
Solubility In water c. 1.5 mg/l (pH 7, 20 ºC). Readily soluble in most organic solvents.
Stability Hydrolysis DT50 89 h (pH 5), 58.5 h (pH 7), 6.2 h (pH 9) (all 25 ºC). F.p. 131 °C

APPLICATIONS
Biochemistry Photosynthetic electron transport inhibitor at the photosystem II receptor site. Mode of action Selective contact herbicide, absorbed predominantly by the leaves.
Uses Post-emergence control of annual broad-leaved weeds, especially Solanum spp., Chenopodium spp., Galium aparine, Kochia scoparia and Amaranthus retroflexus (triazine-resistant biotypes), and some grass weeds, in maize, sweet corn, oilseed rape, cereals, rice, peanuts and vegetables, at 0.9 kg a.i./ha. Often used in combination with a triazine or other product, to extend the spectrum of activity. Phytotoxicity Should not be applied in mixture with, or within 14 days of, any other product which may result in de-waxing of crop foliage.
Formulation types EC; WP.

OTHER TRADENAMES
'Tough' (USA) (Syngenta); 'Zintan' (Syngenta) mixtures: 'Lido' (+ terbuthylazine) (Syngenta); 'Sailor' (+ sulcotrione) (Syngenta, Bayer) Discontinued names: 'Barclay Pirate' * (Barclay)