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Chemical Identification
Common Name
Thidiazuron
中文通用名
噻苯隆
IUPAC
1-phenyl-3-(1,2,3-thiadiazol-5-yl)urea
CAS
N-phenyl-N′-1,2,3-thiadiazol-5-ylurea
CAS No.
51707-55-2
Molecular Formula
C9H8N4OS
Molecular Structure
Category
Activity
Thidiazuron is a new and efficient cytokinin for the plants, acting as a straight defoliant by stimulation of the leaf abscission layers, mainly used for cotton and peanut.
CropUse
mainly used for cotton and peanut
Formulation
EC = Emulsifiable concentrate
SC = Suspension concentrate (=flowable concentrate)
WP = Wettable powder
Premix
Gibberellic acid+Thidiazuron
Diuron+Thidiazuron+Ethephon
Thymo+Thidiazuron
Thidiazuron+Ethephon
Gibberellic acid A4,A7+Thidiazuron
 Premix Parters: bensulfuron-methyl; bensulfuron-methyl mefenacet; propanil; diuron
Physical Properties
Molecular weight:220.2; Physical form:Colourless, odourless crystals. Melting point:210.5-212.5 °C ( decomp.); Vapour pressure:4 × 10-6 mPa (25 °C) (Langmuir method); Henry constant:2.84 × 10-8 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 1.77 ( pH 7.3); pKa:8.86; Solubility:In water 31 mg/l (pH 7, 25 °C). In hexane 0.002, methanol 4.20, dichloromethane 0.003, toluene 0.400, acetone 6.67, ethyl acetate 1.1 (all in g/l, 20 °C).; Stability:Rapidly converted to photoisomer, 1-phenyl-3-(1,2,5-thiadiazol-3-yl)urea, in presence of light (l >290 nm). Hydrolytically stable at room temperature from pH 5-9. No decomposition in accelerated storage stabili;
Toxicology
Oral:Acute oral LD50 for mice >5000, rats >4000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >1000, rabbits >4000 mg/kg. Mild eye irritant; non-irritating to skin (rabbits). No skin sensitisation (guinea pigs). Inhalation: LC50 (4 h) for rats >2.3 mg/l air.
Environmental Profile
Ecotoxicology: 
Bees:Non-toxic to honeybees.Birds:Acute oral LD50 for Japanese quail >3160 mg/kg. Dietary LC50 (8 d) for bobwhite quail and mallard ducks >5000 mg/kg diet.Daphnia:LC50 (48 h) >10 mg/l.Fish: LC50 (96 h) for rainbow trout, bluegill sunfish, and catfish >1000 mg/l.Worms: LC50 (14 d) for earthworms >1400 mg/kg. 

Environmental fate: 
Animals:In rats and goats, metabolism involves hydroxylation of the phenyl group, followed by formation of water-soluble conjugates. Following oral administration, the compound is excreted in the urine and faeces within 96 hours.Soil:Strongly adsorbed by soil. DT50 in soil c. 26-144 d (aerobic), 28 d (anaerobic). Essential soil microbial processes are only temporarily influenced, if at all.Plant:Only small amounts of residue (normally <0.1 mg/kg) are likely in cottonseed.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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