NOMENCLATURE    

Common name pyridaben    

IUPAC name 2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one    

Chemical Abstracts name 4-chloro-2-(1,1-dimethylethyl)-5-[[[4-(1,1-dimethylethyl)phenyl]methyl]thio]-3(2H)-pyridazinone 

CAS RN [96489–71–3]    

PHYSICAL CHEMISTRY    

Mol. wt. 364.9 M.f. C₁₉H₂₅ClN₂OS Form Colourless crystals. M.p. 111–112 °C V.p. <0.01 mPa (25 °C) 

Kow logP = 6.37 (23±1 °C, distilled water) Henry <3 × 10^-1 Pa m³ mol^-1 (calc.) S.g./density 1.2 (20 °C) Solubility In water 0.012 mg/l (24 °C). In acetone 460, ethanol 57, hexane 10, benzene 110, xylene 390, cyclohexane 320, n-octanol 63 (all in g/l, 20 °C). Stability Stable at 50 °C for 90 d; unstable to light. Stable to hydrolysis for 30 d in the dark (pH 5, 7 and 9, 25 °C).     

APPLICATIONS    

Biochemistry Inhibitor of mitochondrial electron transport at complex I. 

Mode of action Non-systemic insecticide and acaricide. Rapid knockdown and long residual activity. Active against all developing stages, especially against the larval and nymph stages.    

Uses Control of Acari, Aleyrodidae, Aphididae, Cicadellidae and Thysanoptera on field crops, fruit trees, ornamentals and vegetables.    

Formulation types EC; SC; WP.