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Chemical Identification
Common Name
Oxycarboxin
中文通用名
氧化萎锈灵
IUPAC
2,3-dihydro-6-methyl-5-phenylcarbamoyl-1,4-oxathiine 4,4-dioxide
or
5,6-dihydro-2-methyl-1,4-oxathiine-3-carboxanilide 4,4-dioxide
CAS
5,6-dihydro-2-methyl-N-phenyl-1,4-oxathiin-3-carboxamide 4,4-dioxide
CAS No.
5259-88-1
Molecular Formula
C12H13NO4S
Molecular Structure
Physical Properties
Molecular weight:267.3; Physical form:White solid; ( tech., brownish-grey solid). Density:1.41 g/cm3; Composition:Tech. grade is ×97% pure. Melting point:119.5-121.5℃; Vapour pressure:<5.6 ×10-3 mPa (25℃); Henry constant:<1.07 × 10-6 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 0.772; Solubility:In water 1.4 g/l (25℃). In acetone 83.7 g/l, hexane 8.8 mg/l (25 ℃).; Stability:Stable at 55℃ for 18 d. Hydrolysis DT50 44 d (pH 6, 25℃).
Toxicology
Oral:Acute oral LD50 for male rats 5816, female rats 1632 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >5000 mg/kg. Mild eye irritant; not a skin irritant (rabbits). Inhalation: LC50 (4 h) for rats >5000 mg/l.
Environmental Profile
Ecotoxicology:
Algae: EC50 (96 h) for Chlorella 19.0 mg/l.Bees: LD50 (contact) >181μg/bee.Birds: LD50 for mallard ducks 1250 mg/kg. Dietary LC50 (8 d) for mallard ducks >4640, bobwhite quail >10 000 ppm.Daphnia: LC50 (48 h) 69.1 mg/l.Fish: LC50 (96 h) for rainbow trout 19.9, bluegill sunfish 28.1 mg/l.
Environmental fate:
Soil:Aerobic soil metabolism: DT50 in sandy loam 2.5-8 w. Four metabolites, each accounting for <11%, were identified, all products of opening of the oxathiin ring; most of the remaining material formed tightly-bound soil residues. WATER SOLUBILITY: 1.0% at 25
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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