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Common NamePaclobutrazol
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中文通用名多效唑
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IUPAC(2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol
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CAS(αR,βR)-rel-β-[(4-chlorophenyl)methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol
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CAS No.76738-62-0
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Molecular FormulaC15H20ClN3O
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Molecular Structure
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Category
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ActivityPlant Growth Regulator
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Physical PropertiesMolecular weight:293.8; Physical form:White, crystalline solid. Density:1.22 g/ml; Composition:Tech. material is 90% pure. Melting point:165-166 °C; Vapour pressure:0.001 mPa (20 °C); Henry constant:1.13 × 10-5 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 3.2; Solubility:In water 26 mg/l (20 °C). In acetone 110, cyclohexanone 180, dichloromethane 100, hexane 10, xylene 60, methanol 150, propylene glycol 50 (all in g/l, 20 °C).; Stability:Stable for more than 2 years at 20 °C, and more than 6 months at 50 °C. Stable to hydrolysis (pH 4-9), and not degraded by u.v. light (pH 7, 10 days).
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ToxicologyOral:Acute oral LD50 for male rats 2000, female rats 1300, male mice 490, female mice 1200, guinea pigs 400-600, male rabbits 840, female rabbits 940 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats and rabbits >1000 mg/kg. Mild skin irritant; moderate eye irritant (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) for male rats 4.79, female rats 3.13 mg/l air. Phytotoxicity:Non-phytotoxic, though it intensifies greening. Some spotting
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Environmental ProfileEcotoxicology:
Algae: EC50 (cell volume) for Chlorella fusca 180µmol/l (Pestic. Sci., 47, 337 (1996)).Bees:Acute oral NOEL >0.002 mg/bee; acute percutaneous NOEL >0.040 mg/bee.Birds:Acute oral LD50 for mallard ducks >7900 mg/ kg.Daphnia: LC50 (48 h) 33.2 mg/l.Fish: LC50 (96 h) for rainbow trout 27.8 mg/l. NOEC 3.3 mg/l.
Environmental fate:
Soil:Soil DT50 0.5-1.0 y in general; in calcareous clay loam ( pH 8.8, 14% o.m.), DT50 <42 d; in coarse sandy loam ( pH 6.8, 4% o.m.). WATER SOLUBILITY: Cultar*: 35 ppm. -
Transport InformationSignal Word:CAUTION; Hazard Class:III(Slightly hazardous)
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