Chrysanthemoyl chloride
Chrysanthemoyl chloride
CAS: 14297-81-5
Molecular Formula: C10H15ClO
Chrysanthemoyl chloride - Names and Identifiers
Chrysanthemoyl chloride - Physico-chemical Properties
| Molecular Formula | C10H15ClO |
| Molar Mass | 186.68 |
| Density | 1.098 |
| Boling Point | 206°C |
| Flash Point | 100°C |
| Vapor Presure | 0.243mmHg at 25°C |
| Refractive Index | 1.533 |
| Physical and Chemical Properties | Density 1.098 boiling point 206°C flash point 100°C |
Chrysanthemoyl chloride - Reference Information
| Use | pyrethroid chloride is an important intermediate of pyrethroid, which can be used to synthesize, pyrethroids such as fenfurthrin and phenylethrin. |
| production method | in the preparation of pyrethroids, the reaction between the pyrethroid chloride and the corresponding alcohol is generally used, therefore, pyrethroid chloride is also an important intermediate in the production of pyrethroids. Its preparation method is more common, there are thionyl chloride method, phosphorus trichloride method and phosgene method, these three methods have their own characteristics, now see figure. Thionyl chloride method in the presence of catalyst DMF, the chrysanthemum acid and thionyl chloride in a certain inert solvent (such as benzene, toluene, dichloroethane, etc.), the 2 solvent and excess thionyl chloride were distilled off, followed by distillation under reduced pressure to obtain the polyaryl chloride. The high purity of the method is obtained, but the quality of thionyl chloride is the key. At present, most of the domestic production of chrysanthemum chloride is produced by this method. The phosphorus trichloride method dissolves the chrysanthemum acid in toluene or benzene, places it in the reactor, adds the metered phosphorus trichloride, heats and agitates for 4~6 hours, stands for stratification, and separates the lower phosphorous acid, the reaction solution of the upper layer was transferred into a distillation pan, and the solvent was distilled off first, followed by distillation under reduced pressure to obtain a polyaryl chloride. Phosphorus trichloride method, the separation of phosphorous acid is the key, will affect the quality of the chrysanthemum acyl chloride, and phosphorous acid to be recycled. The pyretic acid is dissolved in toluene by phosgene method, and the catalyst is added to raise the temperature to about 90 ℃, After passing a certain amount of phosgene to the end point under stirring, the remaining phosgene is removed with nitrogen, and the remaining phosgene is to be absorbed and utilized. The reaction solution is transferred into a distillation Pan and desolvated under reduced pressure to obtain chrysanthemum chloride. Generally, the chrysanthemum acid chloride prepared by the phosgene method is no longer rectified, because its purity is high, but the use of phosgene should pay attention to safety, and the tail gas should be destroyed by alkali and catalyst. |
Last Update：2024-04-10 22:29:15
