Dimethylphosphorodithioate
O,O-Dimethyl Dithiophosphate
CAS: 756-80-9
Molecular Formula: C2H7O2PS2
Dimethylphosphorodithioate - Names and Identifiers
Dimethylphosphorodithioate - Physico-chemical Properties
| Molecular Formula | C2H7O2PS2 |
| Molar Mass | 158.18 |
| Density | 1.29 |
| Boling Point | 65℃ |
| Flash Point | 71.2°C |
| Water Solubility | 226g/L at 20℃ |
| Vapor Presure | 1.33hPa at 48.5℃ |
| Appearance | clear liquid |
| Color | Colorless to Light yellow to Red |
| pKa | -0.10±0.30(Predicted) |
| Storage Condition | -20°C |
| Refractive Index | 1.535 |
| Physical and Chemical Properties | Characteristics of colorless liquid, industrial black liquid. There is a bad smell. boiling point 65 ℃ relative density 1.29 refractive index 1.535 |
| Use | Used as pesticide intermediates, mainly for the preparation of dimethoate, malathion and other organophosphorus pesticides |
Dimethylphosphorodithioate - Nature
Open Data Verified Data
colorless liquid, industrial black liquid. There is a bad smell. Relative density (d25) 1.29. Boiling point of 65 degrees C (2kPa). Refractive index 535.
Last Update：2025-06-10 22:55:16
Dimethylphosphorodithioate - Preparation Method
Open Data Verified Data
methanol and phosphorus pentasulfide reaction directly to produce this product.
Last Update：2022-01-01 10:38:10
Dimethylphosphorodithioate - Application
Open Data Verified Data
This product is a pesticide intermediate, mainly used for the preparation of dimethoate, malathion and other organophosphorus pesticides.
Last Update：2025-08-19 16:24:40
Dimethylphosphorodithioate - Safety
Open Data Verified Data
- This product is toxic. Has a stimulating effect on the skin. The production site should be well ventilated, the equipment should be sealed, and the operator should wear protective equipment.
- closed packaging of plastic or iron barrels. Store in a cool, ventilated and dry place. Protection against heat and sun. According to the provisions of toxic substances storage and transportation.
Last Update：2025-06-10 22:55:16
Dimethylphosphorodithioate - Reference Information
| LogP | -0.7 at 22℃ |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Application | used as pesticide intermediates, mainly used in the preparation of dimethoate, malathion and other organophosphorus pesticides O,O-dimethyl dithiophosphate referred to as methyl sulfide, is an important organic phosphorus pesticide intermediates, can be directly synthesized insecticide dimethoate, malathion, thiophos, rice, phosphorus, herbicide phosphorus, fungicides, such as Gram, another organophosphorus intermediate O,O-dimethylthiophosphoryl chloride can also be obtained by chlorination. |
| production method | methyl sulfide is prepared by esterification of phosphorus pentasulfide with methanol. Add a certain amount of sulfide and phosphorus pentasulfide to the reaction tank according to the mass ratio of about 0.7: 1, and add methanol Dropwise at a certain molar ratio under stirring, and control the dropping temperature at 40~45 ℃, after about 2H of addition, the reaction was continued at 50-55 ° C. For about 2H, and cooled to 35 ° C. To obtain the finished product, and the yield was above 75%. The hydrogen sulfide produced by the reaction is introduced into the absorption tower and absorbed by the alkali solution. In China, methyl sulfide is also synthesized by a new catalytic process, which improves the quality and yield of the product. By selecting appropriate catalyst and certain reaction conditions, the average content of methyl sulfide was 94.20%, and the average yield was 93.84%. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 02:00:11
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