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Chemical Identification
Common Name
Cinmethylin
中文通用名
环庚草醚
IUPAC
(1RS,2SR,4SR)-1,4-epoxy-p-menth-2-yl 2-methylbenzyl ether
CAS
(1R,2S,4S)-rel-1-methyl-4-(1-methylethyl)-2-[(2-methylphenyl)methoxy]-7-oxabicyclo[2.2.1]heptane
CAS No.
87818-31-3
Molecular Formula
C18H26O2
Molecular Structure
Category
Activity
Herbicide
Premix
Bensulfuron-methyl+cinmethylin
Physical Properties
Molecular weight:274.4; Physical form:Dark amber liquid. Density:1.014 g/ml (20 °C); Flash point:147 °C (ASTM D93);Boiling point 313°C at 760 mm/Hg. Vapour pressure:10.1 mPa (20 °C); Henry constant:4.40×10-2 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 3.84; Solubility:In water 63 mg/l (20 °C). Miscible with a range of organic solvents.; Stability:Thermally stable up to 145 °C. Hydrolytically stable from pH 5 to pH 9 at 25 °C. Light-catalysed decomposition occurs in the presence of air. Chemically, thermally stable. Miscible in a range of other solvents.
Toxicology
Oral:Acute oral LD50 for rats 3960 mg/kg. Percutaneous:Acute percutaneous LD50 for rats and rabbits >2000 mg/kg; moderate skin and mild eye irritant to rabbits. Inhalation: LC50 (4 h) for rats >3.5 mg/l. ADI:0.01 mg/kg.
Environmental Profile
Ecotoxicology: Birds:Acute oral LD50 for bobwhite quail >2150 mg/kg. Dietary LC50 (5 d) for bobwhite quail and mallard ducks >5620 mg/kg diet. Daphnia:LC50 (48 h) 7.2 mg/l. Fish:LC50 (96 h) for rainbow trout 6.6, bluegill sunfish 6.4, sheepshead minnow 1.6 mg/l.Other aquatic spp.: LC50 for fiddler crab >1000 mg/l. Environmental fate: Animals:For a study of the metabolism of cinmethylin in the goat, see J. Agric. Food Chem., 1989, 37, 787.Soil:Strongly adsorbed by soils (B. T. Grayson et al., Pestic. Sci., 1987, 21, 143), but relatively short-lived in the environment, being broken down in the soil under aerobic conditions. WATER SOLUBILITY: 63 ppm.
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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