Molecular Formula | C8H10Br4O2 |
Molar Mass | 457.78 |
Physical and Chemical Properties | Chemical quality This product is a white solid, m.p.150 ℃, insoluble in water, soluble in ethanol, benzene, carbon tetrachloride and other solvents. |
Use | Use 3-(1,2,2, 2-tetrabromoethyl)-2, 2-dimethylcyclopropanecarboxylic acid, short for tetrabromopyretic acid, is an intermediate of tetrabromothrin. |
Raw Materials | Aluminum 1,2-Dibromoethane Cyclopropanecarboxylic acid TRALOMETHRIN 1,2-DIBROMOETHYLENE Bromate|Bromide, 0.1N Standardized Solution |
The preparation method is 3-(2, 2-dibromovinyl)-2, 2-dimethylcyclopropane carboxylic acid as raw material, and the addition reaction with bromine to obtain tetrabromochrysanthemum acid. Dissolve bromine in carbon tetrachloride, then add 3-(2,2-dibromovinyl)-2,2-dimethylcyclopropane carboxylic acid carbon tetrachloride solution, stir at 20 ℃ for 1h, evaporate to dry under reduced pressure to obtain crude residue, and then recrystallize in carbon tetrachloride to obtain pure tetrabromochrysanthemum acid with a melting point of 150 ℃.
Methyl dichlorochrysanthemum can also be used as raw material, mixed with bromine, metal aluminum and bromine-containing solution to generate methyl tetrabromochrysanthemum. Dissolve bromine in 1,2-dibromoethane, add aluminum sheets and mix, keep the temperature at 3~10 ℃, add dibromoethane solution of methyl dichlorochrysanthemum acid dropwise, stir, let stand overnight, stir for 5h, extract with chloroform, wash with Na2CO3 saturated aqueous solution and water in turn, dry, dissolve under reduced pressure, distill to obtain methyl tetrabromochrysanthemum acid, and.