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Common name penconazole (BSI, draft E-ISO, (m) draft F-ISO)
IUPAC name 1-(2,4-dichloro-b-propylphenethyl)-1H-1,2,4-triazole
Chemical Abstracts name 1-[2-(2,4-dichlorophenyl)pentyl]-1H-1,2,4-triazole
CAS RN [66246-88-6]
PHYSICAL CHEMISTRY
Mol. wt. 284.2 M.f. C13H15Cl2N3 Form Fine white powder. M.p. 57.6-60.3 ºC V.p. 0.17 mPa (20 °C); 0.37 mPa (25 °C) KOW logP = 3.72 (pH 5.7, 25 ºC). Henry 6.6 ´ 10-4 Pa m3 mol-1 (20 °C, calc.). S.g./density 1.30 (20 ºC) Solubility In water 73 g/m3 (20 ºC). In ethanol 730, acetone 770, toluene 610, n-hexane 22, n-octanol 400 (all in g/l, 25 ºC). Stability Stable to hydrolysis (pH 1-13), and to temperatures up to 350 ºC. pKa 1.51, v. weak base
APPLICATIONS
Biochemistry Sterol demethylation inhibitor; inhibits cell membrane ergosterol biosynthesis, stopping development of the fungi.
Mode of action Systemic fungicide with protective and curative action. Absorbed by the leaves, with translocation acropetally.
Uses Control of powdery mildew, pome fruit scab and other pathogenic Ascomycetes, Basidiomycetes and Deuteromycetes on vines, pome fruit, stone fruit, ornamentals, hops and vegetables, at 25-75 g/ha.