NOMENCLATURE
Common name isoproturon
IUPAC name 3-(4-isopropylphenyl)-1,1-dimethylurea; 3-p-cumenyl-1,1-dimethylurea
Chemical Abstracts name N,N-dimethyl-N′-[4-(1-methylethyl)phenyl]urea
CAS RN [34123–59–6]
EC no 251–835–4
PHYSICAL CHEMISTRY
Mol. wt. 206.3 M.f. C12H18N2O Form Colourless crystals. M.p. 158 °C; (tech., 153–156 °C) V.p. 3.15 × 10-3 mPa (20 °C); 8.1 × 10-3 mPa (25 °C) Kow logP = 2.5 (20 °C) Henry 1.46 × 10-5 Pa m3 mol-1 S.g./density 1.2 (20 °C) Solubility In water 65 mg/l (22 °C). In methanol 75, dichloromethane 63, acetone 38, benzene 5, xylol 4, n-hexane c. 0.2 (all in g/l, 20 °C). Stability Very stable to light, acids, and alkalis. Hydrolytically cleaved by strong alkalis on heating. DT50 1560 d (pH 7).
APPLICATIONS
Biochemistry Photosynthetic electron transport inhibitor at the photosystem II receptor site. Mode of action Selective systemic herbicide, absorbed by the roots and leaves, with translocation.
Uses Pre- and post-emergence control of annual grasses (Alopecurus myosuroides, Apera spica-venti, Avena fatua and Poa annua) and many annual broad-leaved weeds in spring and winter wheat (except durum wheat), spring and winter barley, winter rye, and triticale, at 1.0–1.5 kg/ha.
Phytotoxicity Non-phytotoxic to cereals, except durum wheats.
Formulation types SC; WP.
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