Products

 

DIURON

 

Herbicide: urea
 

NOMENCLATURE
Common name diuron (BSI, E-ISO, (m) F-ISO, ANSI, WSSA); DCMU (JMAF); dichlorfenidim* (former exception, USSR)
IUPAC name 3-(3,4-dichlorophenyl)-1,1-dimethylurea 
Chemical Abstracts name N'-(3,4-dichlorophenyl)-N,N-dimethylurea 
CAS RN [330-54-1]  EEC no. 206-354-4  Development codes DPX 14740 (Du Pont) 
 PHYSICAL CHEMISTRY
Mol. wt. 233.1  M.f. C9H10Cl2N2O  Form Colourless crystals.  M.p. 158-159 ºC  V.p. 1.1 ´ 10-3 mPa (25 ºC)  KOW logP = 2.85?.03 (25 ºC)  Henry 7.04 ´ 10-6 Pa m3 mol-1 (calc.)  S.g./density 1.48  Solubility In water 36.4 mg/l (25 ºC). In acetone 53, butyl stearate 1.4, benzene 1.2 (all in g/kg, 27 ºC). 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 ºC. 

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, at 10-30 kg a.i./ha. 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, at 0.6-4.8 kg/ha. Phytotoxic residues in soil disappear within 1 season at these lower rates.  Formulation types SC; WP.