IUPAC name 3-(3,4-dichlorophenyl)-1,1-dimethylurea

Chemical Abstracts name N′-(3,4-dichlorophenyl)-N,N-dimethylurea

CAS RN [330–54–1]

PHYSICAL CHEMISTRY    

Mol. wt. 233.1 M.f. C₉H₁₀Cl₂N₂O Form Colourless crystals. M.p. 158–159 °C V.p. 1.1 × 10^-3 mPa (25 °C) Kow logP = 2.85±0.03 (25 °C) S.g./density 1.48 Solubility In water 37.4 mg/l (25 °C). In acetone 53, butyl stearate 1.4, benzene 1.2 (all in g/kg, 27 °C). Sparingly soluble in hydrocarbons. Stability Stable in neutral media at normal temperatures, but hydrolysed at elevated temperatures. Hydrolysed by acids and alkalis. Decomposes at 180–190 °C.     

APPLICATIONS    

Biochemistry Photosynthetic electron transport inhibitor at the photosystem II receptor site. 

Mode of action Systemic herbicide, absorbed principally by the roots, with translocation acropetally in the xylem.    

Uses Total control of weeds and mosses on non-crop areas. Selective control of germinating grass and broad-leaved weeds in many crops, including asparagus, tree fruit, bush fruit, citrus fruit, vines, olives, pineapples, bananas, sugar cane, cotton, peppermint, alfalfa, forage legumes, cereals, maize, sorghum, and perennial grass-seed crops. 

Formulation types SC; WG; WP.