Chemical Identification
Common Name
Cafenstrole
中文通用名
唑草胺
IUPAC
N,N-diethyl-3-mesitylsulfonyl-1H-1,2,4-triazole-1-carboxamide
CAS
N,N-diethyl-3-[(2,4,6-trimethylphenyl)sulfonyl]-1H-1,2,4-triazole-1-carboxamide
CAS No.
125306-83-4
Molecular Formula
C16H22N4O3S
Molecular Structure
Category
Activity
Herbicide.
Cafenstrole is active from pre-emergence to early post-emergence (three-leaf stage). It has residual activity lasting up to 50 days in paddy fields and 90-150 days in turf.  The product shows very high selectivity for rice and turf. Selectivity in seeded rice is marginal and depends on the application timing.

In field trials in rice, cafenstrole gave better results (both in terms of weed control and residual activity) than pretilachlor.

Cafenstrole is safe to use for grass control in Zoysia turf (Zoysia japonicaand Z matrelia).
CropUse
Crop uses:
Transplanted rice, turf

Rice

210-300 g ai/ha

Turf

1,000-2,000 g ai/ha

Physical Properties
Molecular weight:350.5; Physical form:Colourless crystals. Density:1.30 (25 °C); Melting point:114-116 °C; Vapour pressure:5.3 ×10-5 mPa(20 °C); Partition coefficient(n-octanol and water):logP = 3.21; Solubility: In water 2.5 mg/l (20 °C).; Stability:Stable in neutral and weakly acidic media. Relatively stable to heat.
Toxicology
Oral:Acute oral LD50 for rats and mice >5000 mg/kg. Percutaneous:Acute percutaneous LD50for rats >2000 mg/kg. Inhalation:LC50(14 d) for rats >1.97 g/m3. ADI:(JMPR) 0.0003 mg/kg[1991].
Environmental Profile
Ecotoxicology: Bees:Acute oral LC50 (72 h) for bees >1000 ppm; contact LC50 (72 h) >5000 ppm.Birds:Acute oral LD50 for quail and mallard ducks >2000 mg/kg.Daphnia: LC50(3 h) >500 mg/kg.Fish:LC50 (48 h) for carp >1.2 mg/l. Environmental fate: Animals:The major metabolite in the rat and dog is 3-(2,4,6-trimethylphenylsulfonyl)-1,2,4-triazole.Soil:DT50(Japanese paddy) c. 7 d, (Japanese upland) c. 8 d.Plant:The major metabolite in rice is the same as in the rat.
WATER SOLUBILITY: 2.5 mg/l (20°C)
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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