Penconazole

TC & FORMULATION: 97%TC, 10%EC, 10%EW

Structure Formula

NOMENCLATURE

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]  EEC no. 266-275-6 

PHYSICAL CHEMISTRY

Mol. wt. 284.2  M.f. C13H15Cl2N3  Form Fine white powder.  M.p. 60.3-61.0 °C  B.p. >360 °C; 99.2 °C/1.9 Pa  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 mg/l (25 ºC). In ethanol 730, acetone 770, toluene 610, n-hexane 24, 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. Formulation types EC; EW; WP.

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