Methyl permethrin 1 detection

Methyl permethrin; Methoxymethrin; 4-Methoxymethylbenzyl (R, S) cis, trans -2,2-dimethyl-3-dimethyl-3- (2-methyl-1-propenyl) cyclopropanecarboxylate, trimethoprim. The original drug is a light yellow to reddish brown transparent oily liquid. The pure product is a colorless oily liquid. Easily soluble in organic solvents such as alcohol, acetone, benzene, toluene, etc., also soluble in kerosene, insoluble in water. Permethrin is used to prevent and control health pests such as mosquitoes and flies, and can be used to make mosquito coils and electric insect repellents. In permethrin mosquito repellent incense, the general effective ingredient is 0.35%, and an appropriate amount of synergist is added; Its kerosene spray is used to kill indoor mosquitoes and flies, with a dosage of 0.5-2.0ml per cubic meter of space. Add glycine to anhydrous ethanol saturated with hydrogen chloride gas under stirring, heat and reflux until fully dissolved to obtain glycine ethyl ester hydrochloride. In an aqueous solution of sodium nitrite, add 2,5-dimethyl-hexane-2,4-diene (obtained by reacting acetone with acetylene), drop into a pH 1.0 solution of glycine ethyl ester hydrochloride saline (adjusted with 10% sulfuric acid), at a reaction temperature of 18-20 ℃, to obtain diazoacetate ethyl ester. Add a precipitated copper catalyst and a small amount of p-cresol, stir and reflux until no nitrogen gas is released. Collect the fraction at 114-121 ℃ (3.33 kPa) to obtain ethyl chrysanthnate, and saponify it with an ethanol solution of sodium hydroxide, After removing ethanol and water, polar non proton solvent 4- (methoxymethyl) benzyl chloride and catalyst were added. The reaction lasted for several hours at 85-90 ℃, and the 190 ℃ (0.67Pa) fraction was collected to obtain permethrin. 4- (Methoxymethyl) benzyl chloride is prepared from p-xylene as raw material and then subjected to etherification reaction to obtain p-dichlorobenzene. The main preparations include: 20% emulsifiable concentrate (with an additional synergist), 0.2% kerosene spray (with an additional permethrin, permethrin, or fenvalerate), mosquito repellent incense, and electric mosquito repellent tablets

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