Ethirimol

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Ethirimol

中文通用名

乙嘧酚

IUPAC

5-butyl-2-ethylamino-6-methylpyrimidin-4-ol

CAS

5-butyl-2-(ethylamino)-6-methyl-4(1H)-pyrimidinone

CAS No.

23947-60-6

Molecular Formula

C₁₁H₁₉N₃O

Molecular Structure

General Product Information

Category

Fungicides > Pyrimidine fungicides

Activity

Fungicide

Premix

Trifloxystrobin+Ethirimol
Thiophanate-methyl+Ethirimol
Pyraclostrobin+Ethirimol
Ethirimol+Kresoxim-methyl
Boscalid+Ethirimol
Premix Parters: disulfoton;

Physical & Safety Data

Physical Properties

Molecular weight:209.3; Physical form:Colourless crystals. Density:1.21 (25 °C); Composition:Tech. material is 97% pure. Melting point:159-160 °C (phase change at c. 140 °C); Vapour pressure:0.267 mPa (25 °C); Henry constant:>2 × 10-4 ( pH 5.2), >4 × 10-4 ( pH 7.3), >4 × 10-4 ( pH 9.3) Pa m3 mol-1 (20 °C); Partition coefficient(n-octanol and water):logP = 2.3 ( pH 7, 20 °C); pKa:5, weak base (K. Chamberlain et al., Pestic. Sci., 47, 265 (1996) and ref. therein).; Solubility:In water 253 ( pH 5.2), 150 ( pH 7.3), 153 ( pH 9.3) (all in mg/l, 20 °C). In chloroform 150, ethanol 24, acetone 5 (all in g/ kg, 20 °C).; Stability:Stable to heat, and in acidic and alkaline solutions in the dark. Aqueous solution exposed to sunlight and air had DT50 c. 21 d.

Toxicology

Oral:Acute oral LD₅₀ for female rats 6340, mice 4000, female guinea pigs 500-1000, male rabbits 1000-2000 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rats >2000 mg/kg. Mild eye irritant; non-irritating to skin (rats). Not a skin sensitiser (guinea pigs). Inhalation: LC₅₀ for rats >4.92 mg/l. ADI:( JMPR) 0.002 mg/ kg b.w. [1990].

Environmental Profile

Ecotoxicology:
Bees: LD₅₀ (oral) 1.6 mg/bee.Birds:Acute oral LD₅₀ for hens 4000 mg/ kg.Daphnia: LC₅₀ (48 h) 53 mg/l.Fish: LC₅₀ (96 h) for young brown trout 20, rainbow trout 66 mg/l.

Environmental fate:
Animals:In rats, following oral administration, metabolism involves hydroxylation of the butyl group. Elimination is in the urine.Soil:Soil DT₅₀ 14-140 d ( o.m. 1.0-10.1%, pH 7.8-8.1).Plant:In plants, ethirimol undergoes rapid degradation, 2-amino-5-butyl-6-hydroxy-4-methylpyrimidine being found as a metabolite. DT₅₀ in plants c. 3 d.

Transport Information

Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)