Title: Diuron
CAS Registry Number: 330-54-1
CAS Name: N¢-(3,4-Dichlorophenyl)-N,N-dimethylurea
Additional Names: 1,1-dimethyl-3-(3,4-dichlorophenyl)urea
Trademarks: Diurex (Makhteshim-Agan); Karmex; Urox D (Hopkins)
Molecular Formula: C9H10Cl2N2O
Molecular Weight: 233.09
Percent Composition: C 46.38%, H 4.32%, Cl 30.42%, N 12.02%, O 6.86%
Literature References: Prepn: Jones, US 2768971 (1956 to I.C.I.). Toxicity data: E. M. Boyd, V. Krupa, J. Agric. Food Chem. 18, 1104 (1970). Review of environmental impact: S. Giacomazzi, N. Cochet, Chemosphere 56, 1021-1032 (2004).
Properties: Crystals, mp 158-159°. Soly in water at 25°: 42 ppm. Very low soly in hydrocarbon solvents. Vapor pressure at 50°: 3.1 ´ 10-6 mm Hg. Partition coefficient (octanol/water): 2.6. LD50 orally in rats: 1690 mg/kg (Boyd, Krupa).
Melting point: mp 158-159°
Log P: Partition coefficient (octanol/water): 2.6
Toxicity data: LD50 orally in rats: 1690 mg/kg (Boyd, Krupa)
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, nose, throat. Potential symptoms of overexposure in exptl animals are anemia, methemoglobinemia. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 124.
Use: Pre-emergent herbicide.
Divicine Dixanthogen Dixyrazine Djenkolic Acid D-Lactic Acid

CAS number 330-54-1 YesY
ChemSpider 3008 YesY
KEGG C18428 YesY
ChEBI CHEBI:116509 YesY
Jmol-3D images Image 1
Molecular formula C9H10Cl2N2O
Molar mass 233.09 g mol−1
Density 1.48 g/cm3
Melting point 158 °C; 316 °F; 431 K
Boiling point 180 °C; 356 °F; 453 K
Solubility in water 42 mg/L
EU classification Harmful (Xn); Dangerous for the environment (N)
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea) is an herbicide that inhibits photosynthesis. It was introduced by Bayer in 1954 under the trade name of Diuron.