Propanil

TC&FORMULATION: 97%TC, 360G/L EC, 480G/L EC, 80%WDG, Propanil 360G/L+2,4-D 250G/L EC

Structure Formula:

NOMENCLATURE

Common name propanil

IUPAC name 3',4'-dichloropropionanilide 

Chemical Abstracts name N-(3,4-dichlorophenyl)propanamide  Other names 3,4-DCPA  CAS RN [709-98-8]  EEC no. 211-914-6

PHYSICAL CHEMISTRY

Composition Tech. is 97% nominal.  Mol. wt. 218.1  M.f. C9H9Cl2NO  Form Colourless, odourless crystals; (tech. is a medium to dark grey, crystalline solid).  M.p. 91.5 °C  B.p. 351 °C  V.p. 0.02 mPa (20 ºC); 0.05 mPa (25 ºC)  KOW logP = 3.3 (20 °C)  Henry 1.7 ´ 10-4 Pa m3 mol-1  S.g./density 1.41 g/cm3 (22 ºC)  Solubility In water 130 mg/l (20 ºC). In isopropanol, dichloromethane >200, toluene 50-100, hexane <1 (all in g/l, 20 ºC). In benzene 7 ´ 104, acetone 1.7 ´ 106, ethanol 1.1 ´ 106 (all in ppm, 25 ºC).  Stability Hydrolysed in strongly acidic and alkaline media to 3,4-dichloroaniline and propionic acid; stable at normal pH range: DT50 (22 ºC) >>1 y (pH 4, 7, 9). Rapidly degraded in water by sunlight; photolysis DT50 12-13 h.

APPLICATIONS

Biochemistry Photosynthetic electron transport inhibitor at the photosystem II receptor site.  Mode of action Selective contact herbicide with a short duration of activity.  Uses Contact herbicide used post-emergence in rice, at 2.5-5.0 kg/ha, to control broad-leaved and grass weeds, including Amaranthus retroflexus,Digitaria spp., Echinochloa spp., Panicum spp., and Setaria spp. Also used, in mixture with MCPA, in wheat. A mixture with carbaryl is used in citrus crops grown in sod culture. Phytotoxicity Phytotoxic to many broad-leaved crops. Normally phytotoxic to crops which have been treated with organophosphate or carbamate insecticides.  Formulation types EC; SC; UL.  Compatibility Incompatible with a number of pesticides, particularly carbamates and organophosphates. Incompatible with liquid fertilisers. 

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