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Chemical Identification
Common Name
Pyrimidifen
中文通用名
嘧螨醚
IUPAC
5-chloro-N-{2-[4-(2-ethoxyethyl)-2,3-dimethylphenoxy]ethyl}-6-ethylpyrimidin-4-amine
CAS
5-chloro-N-[2-[4-(2-ethoxyethyl)-2,3-dimethylphenoxy]ethyl]-6-ethyl-4-pyrimidinamine
CAS No.
105779-78-0
Molecular Formula
C20H28ClN3O2
Molecular Structure
Category
Activity
Acaricide/Miticide.Pyrimidifen controls all life stages of mites. It is a contact and stomach poison.
CropUse
CropUses:
apples, cabbages, citrus, cotton, fruits, ornamentals, strawberries, tea, tomatoes, vegetables

 

25-150 g ai/ha

Physical Properties
Molecular weight:377.9; Physical form:Colourless crystals. Density:1.22 (20 °C); Melting point:69.4-70.9 °C; Vapour pressure:1.6 × 10-4 mPa (25 °C); Henry constant:2.09 × 10-10 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 4.59 (23 °C); Solubility:In water 2.17 mg/l (25 °C).; Stability:Stable in acid and alkali.Solubility at 25°C in acetonitrile 97 g/l, methanol 276 g/l, n-hexane 34 g/l, xylene 364 g/l, dimethylsulfoxide 307 g/l.
Toxicology
(Rat): Oral LD50 148 mg/kg (male), 115 mg/kg (female), Dermal LD50 >2000 mg/kg (male, female).ADI:0.17-0.2 mg/ kg.
Environmental Profile
Ecotoxicology:

Mallard duck

LD50 445 mg/kg

Quail

LD50 212 mg/kg

Carp [48 h]

LC50 0.093 mg/L

Bee [contact]

LD50 0.66 μg/bee

WATER SOLUBILITY: 2.17 mg/l at 25°C
Fate in soil:

Pyrimidifen is degraded by microbes. It has a half-life of 5-9 days under field conditions.

Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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