| Name | Miewenjuzhi |
| Synonyms | JS 88 PY 115 pentmethrin Miewenjuzhi (α-cyano-1-methyl) butenyl-2,2-dimethyl-3-(2,2-dichlorovinyl) cyclo propanecarboxylate |
| Molecular Formula | C15H19Cl2NO2 |
| Physical and Chemical Properties | Chemical properties of industrial crude oil is brown liquid with content> 85%, B. p.150 ~ 152 ℃/4.0 × 102Pa, relative density 1.138(20 ℃), vapor pressure 1.37 × 10-2Pa(20 ℃), refractive index n4D1.5065. Soluble in benzene, toluene, ethanol and other organic solvents, insoluble in water. |
| Use | Mainly used for the control of mosquitoes and houseflies, the production of mosquito-repellent incense raw materials. For mosquito coils, spray, spray, etc |
In the presence of a phase transfer catalyst, dichloropyranoyl chloride reacts with 2-methyl-pentenal and sodium cyanide, refluxes for 5h, washes with water, and the aqueous phase is treated with sodium thiosulfate, and the solvent is distilled., To prepare permethrin.
The intermediate 2-methyl-pentyl -2-enal can be prepared by dehydration of propional, that is, propional and catalyst reflux reaction for 6 hours, collect 39~41 ℃(4.0 × 103Pa) fraction, and make clam 2-methyl-pentyl -2-enal. The synthesis of dichlorochrysanthemum chloride can be based on ethyl 3, 3-dimethyl-4-pentenoic acid, or it can be synthesized by the cyclobutanone method (cis/inverse ratio is about 80/20).