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Common name: Paclobutrazol
IUPAC name: (2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol
Chemical Abstracts name:    
CAS RN:[76738-62-0]
Mol. wt.: 293.8
Form:White, crystalline solid.
M.p.: 165-166 ºC
V.p.: 0.001 mPa (20 ºC)
Kow logP= 3.2
Henry:1.13×10-5 Pa m3 mol-1 (calc.)
S.g./density: 1.22 g/ml
Solubility In water 26 mg/l (20 ºC). In acetone 110, cyclohexanone 180, dichloromethane 100, hexane 10, xylene 60, methanol 150, propylene glycol 50 (all in g/l, 20 ºC).
Stability  Stable for more than 2 years at 20 ºC, and more than 6 months at 50 ºC. Stable to hydrolysis (pH 4-9), and not degraded by u.v. light (pH 7, 10 days). 
Oral 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.
Skin and eye 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.
NOEL (1 y) for dogs 75 mg/kg daily; (2 y) for rats 250 mg/kg diet.
ADI (JMPR) 0.1 mg/kg b.w. Other Not mutagenic
Toxicity class WHO (a.i.) III
EPA (formulation) IV
EC hazard (Xn; R20/22| R36| N; R51, R53)
Birds Acute oral   LD50 for mallard ducks >7900 mg/kg.
Fish  LC50 (96 h) for rainbow trout 27.8 mg/l. NOEC 3.3 mg/l.
Daphnia   LC50 (48 h) 33.2 mg/l.
Algae  EC50 (cell volume) for Chlorella fusca 180 mmol/l
Bees  Acute oral NOEL >0.002 mg/bee; acute percutaneous NOEL >0.040 mg/bee.

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