Hymexazol

TC & FORMULATION: 99%TC, 70%WP, 15%SL

Structure Formula 

NOMENCLATURE

Common name hymexazol (BSI, E-ISO, (m) F-ISO); hydroxyisoxazole (JMAF)

IUPAC name 5-methylisoxazol-3-ol 

Chemical Abstracts name 5-methyl-3(2H)-isoxazolone (C.A. preferred tautomer) 

CAS RN [10004-44-1]  EEC no. 233-000-6 

PHYSICAL CHEMISTRY

Composition Tech. is 99% pure.  Mol. wt. 99.1  M.f. C4H5NO2  Form Tech. forms colourless crystals.  M.p. 86-87 ºC  B.p. 202? ºC  V.p. 182 mPa (25 ºC)  KOW logP = 0.480 (unstated pH)  Henry 2.77 ´ 10-4 Pa m3 mol-1 (20 °C, calc.)  S.g./density 0.551  Solubility In water 65.1 (pure), 58.2 (pH 3), 67.8 (pH 9) (all in g/l, 20 °C). In acetone 730, dichloromethane 602, ethyl acetate 437, hexane 12.2, methanol 968, toluene 176 (all in g/l, 20 °C).  Stability Stable under alkaline conditions, and relatively stable under acidic conditions. Stable to light and heat.  pKa 5.92 (20 °C)  F.p. 205? ºC 

APPLICATIONS

Biochemistry Possible DNA/RNA synthesis inhibitor.  Mode of action Systemic soil and seed fungicide.  Uses Control of soil-borne diseases caused by Fusarium, Aphanomyces, Pythium, and Corticium spp., etc. in rice, sugar beet, fodder beet, vegetables, cucurbits, ornamentals, carnations, and forest tree seedlings. Applied as a soil drench, at 30-60 g/hl, or by soil incorporation, and also used as a seed dressing for sugar beet and fodder beet, at 5-90 g/kg seed. Also exhibits some plant growth stimulation activity. Formulation types DP; SL; WP; WS.

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