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Common name myclobutanil (BSI, ANSI, draft E-ISO, (m) draft F-ISO)
IUPAC name 2-p-chlorophenyl-2-(1H-1,2,4-triazol-1-ylmethyl)hexanenitrile; 2-(4-chlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)hexanenitrile
Chemical Abstracts name a-butyl-a-(4-chlorophenyl)-1H-1,2,4-triazole-1-propanenitrile
CAS RN [88671-89-0]
PHYSICAL CHEMISTRY
Mol. wt. 288.8 M.f. C15H17ClN4 Form Pale yellow solid. M.p. 63-68 ºC (tech.) B.p. 202-208 ºC/1 mmHg V.p. 0.213 mPa (25 ºC) KOW logP = 2.94 (pH 7-8, 25 ºC) Henry 4.33 ´ 10-4 Pa m3 mol-1 (calc.) Solubility In water 142 mg/l (25 ºC). Soluble in common organic solvents, e.g. ketones, esters, alcohols and aromatic hydrocarbons, all 50-100 g/l. Insoluble in aliphatic hydrocarbons. Stability Stable under normal storage conditions. Aqueous solutions decompose on exposure to light, DT50 222 d (sterile water), 0.8 d (sensitised sterile water), 25 d (pond water); no hydrolysis (28 ºC) in 28 d (pH 5, 7, and 9).
APPLICATIONS
Biochemistry Inhibits ergosterol biosynthesis (steroid demethylation inhibitor).
Mode of action Systemic fungicide with protective and curative action.
Uses Control of Ascomycetes, Fungi Imperfecti, and Basidiomycetes on a wide variety of crops. For example, used as a foliar treatment for control of scab and powdery mildew in apples and pears; powdery mildew, shot-hole, blossom blight, and rust in stone fruit; powdery mildew in vines and cucurbits; powdery mildew and rusts on ornamentals; rusts on perennial grasses grown for seed; and various diseases of wheat; as a seed treatment for control of seed- and soil-borne diseases in barley, maize, cotton, rice and wheat; and as a post-harvest drench or dip.