methyloxoarsine
methyloxoarsine
CAS: 593-58-8
Molecular Formula: CH3AsO
methyloxoarsine - Names and Identifiers
| Name | methyloxoarsine |
| Synonyms | methyloxoarsine arsorosomethane methylarsine oxide METHYL ARSENIC OXIDE Arsine, methyloxo- (7CI,8CI,9CI) |
| CAS | 593-58-8 |
| EINECS | 209-799-2 |
methyloxoarsine - Physico-chemical Properties
| Molecular Formula | CH3AsO |
| Molar Mass | 105.96 |
methyloxoarsine - References
| Use | arsine methyl oxide is an intermediate of the fungicides formetharsine and Tianan, prevention and Control of rice sheath blight. |
| production method | the preparation method is to put caustic soda and water in the reactor, after stirring until the tablet alkali is completely dissolved into nearly 50% NaOH solution, arsenic trioxide (arsenic trioxide) is added to the alkali solution. After the arsenic trioxide is added, the solution is stirred at 80 ℃ for 2H to make sodium arsenite solution, the whole solution was driven into the methylation kettle, and the temperature was raised to 85 ° C., dimethyl sulfate was slowly dripped, and the temperature of the ester addition was controlled between 87 and 93 ° C., and the input time was about 2.5 to 3 hours. After all the addition is completed, the reaction is continued at 90 ℃ for 2H, and then 10% alkali water is added to the reaction vessel, the temperature is raised to 90~95 ℃ for 1H, the heating is stopped, and the filtrate of the previous batch is added, the mixture was stirred and cooled to below 40 ° C. For filtration, and the filter cake was washed with 5% alkaline water and spin-dried to obtain disodium methyl arsenate. Add disodium methyl arsenate into the melting kettle, add water to dissolve and stir, then drive into the enamel reduction kettle, adjust the pH = 7~8 with sulfuric acid, and then warm up to 90 ℃, pass human sulfur dioxide, and carry out reduction reaction, When pH = 3~4, the passage of sulfur dioxide is stopped, the reaction is maintained for 1H, then the temperature is raised to 90 ° C to keep up with the unreacted sulfur dioxide for 1H, and then the temperature is lowered to 60 ° C to obtain the finished product. As2O3+6NaOH→2Na3AsO3+3H2ONa3AsO3+(CH3)2SO4→CH3AsO(ONa)2+CH3NaSO4CH3AsO(ONa)2+SO2→CH3AsO+Na2SO4 |
Last Update：2024-04-09 21:11:58
