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Chemical Identification
Common Name
Dimethipin
中文通用名
噻节因
IUPAC
2,3-dihydro-5,6-dimethyl-1,4-dithiine 1,1,4,4-tetraoxide
CAS
2,3-dihydro-5,6-dimethyl-1,4-dithiin 1,1,4,4-tetraoxide
CAS No.
55290-64-7
Molecular Formula
C6H10O4S2
Molecular Structure
Category
Activity
Defoliant/Desiccant, herbicide, plant growth regulator
Physical Properties
Molecular weight:210.3. Physical form:Tech. is a white, crystalline solid, mild odor. Density:1.59 g/cm3 (23 °C); Melting point:167-169 °C; Vapour pressure:0.051 mPa (25 °C); Henry constant:2.33×10-6 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = -0.17 (24 °C); pKa:10.88, v. weak acid; Solubility:In water 4.6 g/l (25 °C). In acetonitrile 180, methanol 10.7, toluene 8.979 (all in g/l, 25 °C). Stability:Stable for 1 y at 20 °C, 14 d at 55 °C. Stable to light 7 d at 25 °C. Undergoes degradation in aqueous solution.
Toxicology
Oral:Acute oral LD50 for rats 500 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >5000 mg/kg. Extreme eye irritant; not a dermal irritant (rabbits). Weak sensitiser (guinea pigs). Inhalation: LC50 (4 h) for rats 1.2 mg/l. ADI:0.04 mg/ kg.
Environmental Profile
Ecotoxicology: 
Algae: EC50 (5 d) for Selenastrum capricornutum 5.12 /l.Bees: LD50 >100 μg/bee (25% formulation).Birds:Dietary LC50 (8 d) for mallard ducks and bobwhite quail >5000 ppm. LC50 for mallard ducks 896 mg/kg.Daphnia: LC50 (48 h) 21.3 mg/l.Fish: LC50 (96 h) for rainbow trout 52.8, bluegill sunfish 20.9, sheepshead minnow 17.8 mg/l.Worms: LC50 (14 d) for earthworms >39.4 ppm (25% formulation).Other aquatic spp.: LC50 (96 h) for mysid shrimp (Mysidopsis bahia) 13.9 mg/l. 
Environmental fate: 
Soil: DT50 in soil c. 104-149 d. Kd 0.092; Koc 3.27.Plant:Unchanged.
WATER SOLUBILITY: 2500-3000 ppm.
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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