Description
Difenzoquat metilsulfate is a herbicide mainly used to control wild oats. It is highly soluble in water and has a low volatility. It can be environmentally persistent depending on local conditions. It tends to be moderately toxic to biodiversity. Difenzoquat metilsulfate is also moderately toxic to mammals via the oral route.
Chemical Properties
Pure product is white solid, hygroscopic. m.p. 155～157°C, vapor pressure 1.33×10-5Pa (20°C), relative density 1.13. Solubility in water is 76% (25°C), 78% (37°C), 85% (56°C); slightly soluble in methanol, ethanol; insoluble in petroleum hydrocarbons. Aqueous solution (pH 3-3.4) is stable to light and acidic conditions, unstable to alkali, no effect on storage at 120℃ for 169h. Industrial content >96%, m.p. 150～160℃.
Uses
DIFENZOQUAT METHYLSULFATE is used to control wild oats in wheat, barley, ax, maize, rye grass, vetches and rye grass crops.
Uses
Difenzoquat Methyl Sulfate could have agricultural uses. It could help reduce downward migration of pesticides in soil/turf to allow it to better target pests.
Uses
DIFENZOQUAT METHYLSULFATE is Herbicide; agricultural fungicide.
Production Methods
Difenzoquat metilsulfate is commercially synthesized via a process that begins by reacting 1-methyl-3,5-diphenylpyrazole with concentrated sulfuric acid and methanol at elevated temperatures (~160 DegC), where methanol is gradually distilled and replenished to drive the reaction forward. After sulfonation, the mixture is cooled and treated with 1,2-dichloroethane to facilitate crystallisation and purification of the final product.
Mechanism of action
Selective, absorbed by foliage. Acts via the rapid destruction of cell membranes.
Safety Profile
Poison by ingestion. Moderatelytoxic by skin contact. When heatedto decomposition it emits very toxic fumes of NOx andSOx.
Environmental Fate
Soil. Though no products were reported, the half-life in soil is approximately 3 months (Hartley and Kidd, 1987).
Photolytic. Degrades photolytically to the volatile monomethyl pyrazole (Hartley and Kidd, 1987).
Chemical/Physical. May react with aluminum releasing hydrogen (Hartley and Kidd, 1987).
Pesticide Type
Herbicide; Fungicide
