Chemical Identification
Common Name
Dithianon
中文通用名
二氰蒽醌
IUPAC
5,10-dihydro-5,10-dioxonaphtho[2,3-b]-1,4-dithiine-2,3-dicarbonitrile
CAS
5,10-dihydro-5,10-dioxonaphtho[2,3-b]-1,4-dithiin-2,3-dicarbonitrile
CAS No.
3347-22-6
Molecular Formula
C14H4N2O2S2
Molecular Structure
Category
Activity
Fungicide
Premix
Dithianon+Pyraclostrobin
Dithianon+Trifloxystrobin
Dithianon+Tebuconazole
Difenoconazole+Dithianon
Dithianon+Dimethomorph
Dithianon+Thiophanate-methyl
Aqueous dispersions, wettable powder, flowable. Premix Parters: refined petroleum distillate.
Physical Properties
Molecular weight:296.3. Physical form: Dark brown crystals, with a coppery lustre; ( tech., lighter brown). Density:1576 kg/m3 (20 °C); Melting point:225 °C; ( tech., c. 217 °C); Flash point:Ignition temperature >300 °C; Vapour pressure:2.7×10-6 mPa (25 °C); Henry constant:5.71×10-6 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 3.2; Solubility:In water 0.14 mg/l ( pH 7, 20 °C). In chloroform 12, acetone 10, benzene 8 (all in g/l, 20 °C). Sparingly soluble in methanol and dichloromethane.; Stability:Decomposed by alkaline media, by concentrated acids, and by prolonged heating; DT50 12.2 h ( pH 7, 25 °C). Stable up to 80 °C. Solubility varies in organic solvents.
Toxicology
Oral:Acute oral LD50 for rats 678 mg/kg, guinea pigs 115 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Mild skin and eye irritant. Inhalation: LC50 (4 h) for rats 2.1 mg/l air. Phytotoxicity:Slight russetting may occur on some apple varieties, such as Golden Delicious. ADI:( JMPR) 0.0003 mg/kg b.w. [1991, 1996].
Environmental Profile
Ecotoxicology: 
Algae: EC50 (96 h) 12 mg/l.Bees: Contact LD50 >0.1 mg/bee.Birds:Acute oral LD50 for male quail 430, female quail 290 mg/kg.Daphnia: LC50 (24 h) 2.4 mg/l.Fish:Toxic to fish; LC50 (96 h) for common carp 0.1 mg/l. Worms: LC50 (7 d) 588.4, (14 d) 578.4.Other beneficial spp.:Low hazard to predatory mites. 
Environmental fate: 
Soil:Freundlich K 18-56 mg/kg in soils ( o.c. 0.7-2.6%, pH 4.8-6.6).
WATER SOLUBILITY: Room temperature, approx. 0.05 ppm.
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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