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Hexazinone
    Publish time 2021-12-10 15:15    

A post-emergence contact herbicide effective against many annual and biennial weeds and, except for Sorghum halepense, most perennial weeds

Hexazinone

NOMENCLATURE    

IUPAC name 3-cyclohexyl-6-dimethylamino-1-methyl-1,3,5-triazine-2,4-(1H,3H)-dione

Chemical Abstracts name 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4-(1H,3H)-dione

CAS RN [51235–04–2]


PHYSICAL CHEMISTRY    

Mol. wt. 252.3 M.f. C12H20N4O2 Form Colourless, odourless crystals. M.p. 113.5 °C (purity >98%) B.p. Decomposes on distillation V.p. 0.03 mPa (extrapolated) (25 °C); 8.5 mPa (86 °C) Kow logP = 1.2 (pH 7) Henry 2.54 × 10-7 Pa mmol-1 (25 °C, calc.) S.g./density 1.25 Solubility In water 29.8 g/l (pH 7, 25 °C). In chloroform 3880, methanol 2650, benzene 940, DMF 836, acetone 792, toluene 386, hexane 3 (all in g/kg, 25 °C). Stability Stable in aqueous media between pH 5 and pH 9 and below 37 °C. Decomposed by strong acids and strong alkalis. Stable to light. pKa 2.2 (25 °C)     


APPLICATIONS    

Biochemistry Photosynthetic electron transport inhibitor at the photosystem II receptor site. 

Mode of action Non-selective, primarily contact herbicide, absorbed by the leaves and roots, with translocation acropetally.    

Uses A post-emergence contact herbicide effective against many annual and biennial weeds and, except for Sorghum halepense, most perennial weeds. Used for selective control in alfalfa, pineapples, sugar cane and in plantations of certain coniferous species; also on non-crop areas, but not on sites adjacent to deciduous trees or other desirable plants. 

Phytotoxicity Should not be used for weed control in larch (Larix spp.) or in areas planted with deciduous species.    

Formulation types GR; SL; SP; WG.     


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