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Chemical Identification
Common Name
Dimethirimol
中文通用名
二甲嘧酚
IUPAC
5-butyl-2-dimethylamino-6-methylpyrimidin-4-ol
CAS
5-butyl-2-(dimethylamino)-6-methyl-4(1H)-pyrimidinone
CAS No.
5221-53-4
Molecular Formula
C11H19N3O
Molecular Structure
Physical Properties
Molecular weight:209.3; Physical form:Colourless needles. Melting point:102 °C; Vapour pressure:1.46 (30 °C); Henry constant:<2.55×10-4 Pa m3 mol-1 (25 °C, calc.); Partition coefficient(n-octanol and water):logP = 1.9; Solubility:In water 1.2 g/l (25 °C). Readily soluble in aqueous solutions of strong acids. In chloroform 1200, xylene 360, ethanol 65, acetone 45 (all in g/l, 25 °C).; Stability:Stable in acidic and alkaline solutions. Decomposed by sunlight when in aqueous solution; DT50 c. 7 d. Dissolves in aqueous solutions of strong acids to form water-soluble salts. Stable in acidic and alkaline solutions. Readily soluble in aqueous solutions of strong acids. Solubility at 25°C: acetone 45 g/l, chloroform 1200 g/l, ethanol 65 g/l, xylene 360 g/l.
Toxicology
Oral:Acute oral LD50 for rats 2350 mg/kg, mice 800-1600 mg/kg, guinea pigs 500 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >400 mg/kg. Non-irritating to skin and eyes (rabbits). ADI:( JMPR) 0.02 mg/kg b.w. [1999].
Environmental Profile
Ecotoxicology: 
Bees:Not toxic to bees.Birds:Acute oral LD50 for hens 4000 mg/kg.Fish: LC50 for young brown trout 42 mg/l (24 h), 33 mg/l (48 h), 28 mg/l (96 h). 
Environmental fate: 
Soil:Soil DT50 c. 120 d (sandy soil, glasshouse and John Innes composts).Plant:In plants, metabolism involves demethylation of the dimethylamino group.
WATER SOLUBILITY: 1.2 g/l at 25°C.
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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