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Chemical Identification
Common Name
Benfuresate
中文通用名
呋草黄
IUPAC
2,3-dihydro-3,3-dimethylbenzofuran-5-yl ethanesulfonate
CAS
2,3-dihydro-3,3-dimethyl-5-benzofuranyl ethanesulfonate
CAS No.
68505-69-1
Molecular Formula
C12H16O4S
Molecular Structure
Category
Activity
Benfuresate is most active following pre-plant incorporation to moist soil. It can, however, be applied post-emergence to paddy rice as a granular formulation. It is taken up by the roots of broadleaf plants and via the emerging shoot in grasses and sedges. The activity of benfuresate persists for up to 10 weeks after treatment.

In field trials, benfuresate gave equal or better control than established products at similar use rates. In cotton, the compound gave improved yields relative to conventional herbicide treatments; AgrEvo recommends that cotton seed is not drilled within 1-2 weeks of application. Benfuresate has been shown to be safe to wheat, sugar cane, legumes, brassicas and tomatoes grown in rotation with cotton; and to wheat and cabbages following rice.Herbicide
CropUse
CropUses:
rice, maize, cotton

Cotton

1,600-3,000 g ai/ha

Rice

300-450 g ai/ha (in combination products)

Premix

Type

AI concn

Emulsifiable concentrate (EC)

40% (w/v)

Water-dispersible granule (WG)

1.5% (w/w)

Physical Properties
Molecular weight:256.3; Physical form:Off-white crystals; ( is a light to dark brown, highly viscous liquid). Slight characteristic odour. Density:0.957; Composition:Tech. is ?/SYM>95% pure. Melting point:Stated melting points are: for pure , 30.1 °C; for , 32-35 °C; Flash point:37.5 °C (Abel Pensky). Non-flammable; Vapour pressure:1.43 (20 °C); 2.78 (25 °C) ( 104); Partition coefficient(n-octanol and water):logP = 2.41 (20 °C); Solubility:In water 261 /l (25 °C). In dichloromethane >1220, acetone >1050, toluene >1040, methanol >980, ethyl acetate >920, cyclohexane 51, n-hexane 15.3 (all in g/l).; Stability:Stable to hydrolysis at 5.0, 7.0, 9.2 for 31 d (37 °C); 50 (25 °C) 12.5 d in 0.1 N NaOH.;
Toxicology
Oral:Acute oral 50 for male rats 3536, female rats 2031, male mice 1986, female mice 2809, dogs >1600 /. Percutaneous:Acute percutaneous 50 for rats >5000 /kg. Not a skin or eye irritant. Non-sensitising to skin (guinea pigs). Inhalation:50 for rats >5.34 /l air; not harmful by inhalation. Phytotoxicity:The fol
Environmental Profile
Ecotoxicology: 
Algae:For algae (96 h), bC50 3.8 /l; rC50 15.1 /l; 0.6 /l.Bees:Data not required for registration, due to timing of application.Birds:Acute oral 50 for bobwhite quail 32 272, mallard ducks >10 000 /.Daphnia:50 (48 h) 35.36 /l; 12.6 /l. 50 (48 h) for D. carinata 42 /l.Fish:50 (96 h) for bluegill sunfish 22.3, carp 35, rainbow trout 12.28 /l.Worms:50 (14 d) for earthworms 734.1 /

Environmental fate: 
Animals:Metabolism and elimination were rapid and complete; elimination was predominantly via the urine. Benfuresate is metabolised mainly to the ring open form of the lactone (2,3-dihydro-3,3-dimethyl-2-oxobenzofuran-5-yl ethanesulfonate); this material was elimSoil:In soil, residue studies show that benfuresate is not readily leached and does not accumulate at depths lower than 7.5 cm under field conditions. oc 140-259 (mean 214), Kdes 0.03-11.2. Laboratory 50
Transport Information
Hazard Class:III(Slightly hazardous)

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