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Chemical Identification
Common Name
Benazolin-ethyl
中文通用名
草除灵
IUPAC
ethyl 4-chloro-2,3-dihydro-2-oxo-1,3-benzothiazol-3-ylacetate
CAS
ethyl 4-chloro-2-oxo-3(2H)-benzothiazoleacetate
CAS No.
25059-80-7
Molecular Formula
C11H10ClNO3S
Molecular Structure
Physical Properties
Molecular weight:271.7; Physical form:White crystalline solid; tech. is pale yellow crystalline powder with a characteristic odour. Density:1.45 (20 °C); Melting point:79.2 °C; (tech., 77.4 °C); Vapour pressure:tech. 0.37 mPa (25 °C); Partition coefficient(n-octanol and water):logP = 2.50 (20 °C, in distilled water); Solubility:In water 47 mg/l (20 °C). In acetone 229, dichloromethane 603, ethyl acetate 148, methanol 28.5, toluene 198 (all in g/l, 20 °C).; Stability:Stable to at least 300 °C. Stable in acid and in neutral solution; at pH 9.18, DT50 7.6 d (25 °C). No significant breakdown in water in natural sunlight.
Toxicology
Oral:Acute oral LD50 for mice >4000, rats >6000, dogs >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2100 mg/kg; not an irritant to skin and eyes of rabbits. Not a sensitiser. Inhalation:LC50 (4 h) >5.5 mg/l. Low acute toxicity by inhalation route. ADI:0.006 mg/kg (dogs); 0.36 mg for a 60 kg human.
Environmental Profile
Ecotoxicology: 
Algae:EC50 for Selenastrum capricornutum 16.0 mg/l; NOEL 1.0 mg/l.Bees:10% EC formulation not harmful to bees.Birds:Acute oral LD50 for bobwhite quail >6000, Japanese quail >9709, mallard ducks >3000 mg/kg. Dietary LC50 (5 d) for bobwhite quail; Daphnia:LC50(48 h) 6.2 mg/l. 21 d NOEC(immobilisation) 0.05 mg/l, (reproduction) 0.158 mg/l.Fish:LC50(96 h) for bluegill sunfish 2.8, rainbow trout 5.4 mg/l. Worms:Low toxicity to earthworms: >1000 mg/kg dry soil. 
Environmental fate: 
Animals:Metabolism is by de-esterification of benazolin-ethyl to benazolin with a minor pathway involving opening of the thiazoline ring.Soil:On soil surface exposed to light, DT50 3.5 d. In soil, DT50 1-2 d. Benazolin-ethyl is degraded in soil by hydrolysis of the ester followed by a loss of the acetic acid side-chain, then ring opening; Plant:The major metabolite is benazolin acid.
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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