Dimethipin

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Chemical Identification | General Product Information | Physical & Safety Data

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

General Product Information

Category

Plant growth regulators > Defoliants

Activity

Defoliant/Desiccant, herbicide, plant growth regulator

Physical & Safety Data

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. K_d 0.092; K_oc 3.27.Plant:Unchanged.
WATER SOLUBILITY: 2500-3000 ppm.

Transport Information

Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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Dimethipin

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