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Chemical Identification
Common Name
Benomyl
中文通用名
苯菌灵
IUPAC
methyl 1-(butylcarbamoyl)benzimidazol-2-ylcarbamate
CAS
methyl [1-[(butylamino)carbonyl]-1H-benzimidazol-2-yl]carbamate
CAS No.
17804-35-2
Molecular Formula
C14H18N4O3
Molecular Structure
Category
Activity
Fungicide
CropUse
 
Premix
Diethofencarb+Benomyl
Oil dispersible, wettable powder. Premix Parters: acetochlor; fentrazamide; mefenacet; mefenacet thiobencarb; propanil; thiobencarb;
Physical Properties
Molecular weight:290.3; Physical form:Colourless crystals. Density:Bulk density 0.38; Melting point:140 °C (); Vapour pressure:<5.0 ?/SYM> 10-3 (25 °C); Henry constant:<4.0 ?/SYM> 10-4 ( 5); <5.0 ?/SYM> 10-4 ( 7); <7.7 ?/SYM> 10-4 ( 9) (all in Pa m3 mol-1, ); Partition coefficient(n-octanol and water):logP = 1.37; Solubility:In water 3.6 ( 5), 2.9 ( 7), 1.9 ( 9) (all in mg/l, room temperature). In chloroform 94, dimethylformamide 53, acetone 18, xylene 10, ethanol 4, heptane 0.4 (all in g/,; Stability:Hydrolysis 50 3.5 h ( 5), 1.5 h ( 7), <1 h ( 9) (all 25 °C). In some solvents, dissociates to form carbendazim and butyl isocyanate (M. Chiba & E. A. Cherniak, J. Ag;
Toxicology
Oral:Acute oral 50 for rats >5000 /. Percutaneous:Acute percutaneous 50 for rabbits >5000 /; negligible irritant to skin, temporary to eyes (rabbits). Inhalation:50 (4 h) for rats >2 /l air. Phytotoxicity:Non-phytotoxic if used as directed. Russetting is pos
Environmental Profile
Ecotoxicology: 
Algae:bC50 (72 h) 2.0 /l, (120 h) 3.1 /l.Bees:Not toxic to bees. 50 (contact) >50 mg/bee.Birds:Dietary 50 (8 d) for mallard ducks and bobwhite quail >10 000 / diet (using 50% formulation).Daphnia:50 (48 h) 640 mg/l.Fish:50 (96 h) for rainbow trout 0.27, goldfish 4.2 /l. 50 (48 h) for guppy 3.4 /l.Worms:50 (14 d) 10.5 /

Environmental fate: 
148 concludes that, although benomyl is highly toxic to aquatic organisms, this effect is unlikely to be seen in the field due to the low bioavailability of sediment-bound residues. Earthworm populations may take more than two years toAnimals:In animals, the butylcarbamoyl group is removed to give the relatively stable carbendazim, followed by slow degradation to non-toxic 2-aminobenzimidazole. Hydroxylation also occurs, and the principal metabolite 5-hydroxybenzimidazole carbamate is converteSoil:Benomyl is rapidly converted to carbendazim in the environment, 50 2 and 19 h in water and in soil, respectively. Data from studies on both benomyl and carbendazim are therefore relevant for the evaluation of environmental effPlant:In plants, the butylcarbamoyl group is removed to give the relatively stable carbendazim, followed by slow degradation to non-toxic 2-aminobenzimidazole. Further degradation involves cleavage of the benzimidazole nucleus. Benomyl per se is stable
Transport Information
Signal Word:CAUTION; 
Hazard Class:III(Slightly hazardous)

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