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Common name mesotrione (BSI, pa ISO)
IUPAC name 2-(4-mesyl-2-nitrobenzoyl)cyclohexane-1,3-dione
Chemical Abstracts name 2-[4-(methylsulfonyl)-2-nitrobenzoyl]-1,3-cyclohexanedione
CAS RN [104206-82-8]
PHYSICAL CHEMISTRY
Mol. wt. 339.3 M.f. C14H13NO7S M.p. 165 °C V.p. 5.69 ´ 10-3 mPa (20 °C). Solubility In water 2.2 (pH 4.8), 15 (pH 6.9), 22 (pH 9) (all in g/l, 20 °C). Stability Stable to hydrolysis (pH 4 - 9). pKa 3.12
APPLICATIONS
Biochemistry p-Hydroxyphenyl pyruvate dioxygenase inhibitor, which ultimately affects carotenoid biosynthesis. Selectivity in maize derives from differential metabolism.
Mode of action Uptake is foliar and via the root, with both acropetal and basipetal translocation. Symptoms are whitening of leaves, followed by necrosis of the meristematic tissue.
Uses Under development for pre- (at 100-225 g/ha) and post- (at 70-150 g/ha) emergence control of broad-leaved weeds, such as Xanthium strumarium, Ambrosia trifida, Abutilon theophrasti, and Chenopodium, Amaranthus and Polygonum spp., and some grass weeds, in maize.