Dimethyl phosphite
Dimethyl hydrogen phosphite
CAS: 868-85-9
Molecular Formula: C2H7O3P
Dimethyl phosphite - Names and Identifiers
| Name | Dimethyl hydrogen phosphite |
| Synonyms | (CH3O)2PHO Dimethylphosphit Dimethylphosphite Dimethyl phosphite Dimethyl phosphonate dimethylacidphosphite dimethoxyphosphineoxide Dimethyl acid phosphite Dimethoxyphosphine oxide dimethoxy(oxo)phosphonium Dimethyl hydrogen phosphite Phosphonicaciddimethylester Phosphorous acid dimethyl ester bis(hydroxymethyl)phosphineoxide Dimethylester kyseliny fosforite Dimethyl ester of phosphonic acid (oxido-lambda~5~-phosphanediyl)dimethanol |
| CAS | 868-85-9 |
| EINECS | 212-783-8 |
| InChI | InChI=1/C2H7O3P/c3-1-6(5)2-4/h3-4,6H,1-2H2 |
Dimethyl phosphite - Physico-chemical Properties
| Molecular Formula | C2H7O3P |
| Molar Mass | 110.05 |
| Density | 1.2g/mLat 25°C(lit.) |
| Boling Point | 170-171°C(lit.) |
| Flash Point | 71°C |
| Water Solubility | Soluble in water. |
| Vapor Presure | 0mmHg at 25°C |
| Appearance | Colorless liquid with a mildodor |
| BRN | 1697490 |
| Stability | Stable. Moisture sensitive. Incompatible with water, strong oxidizing agents, acid chlorides, strong bases. |
| Sensitive | Moisture Sensitive |
| Refractive Index | n20/D 1.402(lit.) |
| Physical and Chemical Properties | Density 1.20 boiling point 170-171°C refractive index 1.402 flash point 85 °F |
| Use | This product is an important intermediate of solid glyphosate, trichlorfon, dichlorvos, rice blast, omethoate and other pesticides; Also used in the production of organic phosphoric acid corrosion inhibitor, plastic additives, dye additives and flame retardants. |
Dimethyl phosphite - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R21 - Harmful in contact with skin R36 - Irritating to the eyes R10 - Flammable R68 - Possible risk of irreversible effects R52/53 - Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R43 - May cause sensitization by skin contact R40 - Limited evidence of a carcinogenic effect |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37 - Wear suitable protective clothing and gloves. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 3278 6.1/PG 3 |
| WGK Germany | 1 |
| RTECS | SZ7710000 |
| TSCA | Yes |
| HS Code | 29209013 |
| Hazard Class | 3.2 |
| Packing Group | III |
Dimethyl phosphite - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| (IARC) carcinogen classification | 3 (Vol. 48, 71) 1999 |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Application | dimethyl phosphite can be directly used in the synthesis of organophosphorus pesticide trichlorfon, herbicide glyphosate, etc, it can also be used for the synthesis of other phosphorus-containing intermediates, such as O,O-dimethylphosphoryl chloride, O,O-dimethylthio (alcohol) ammonium phosphate, etc. In addition, it is also an important raw material for organic synthesis, used in the production of organic phosphoric acid corrosion inhibitors, plastic additives, dye additives and textile flame retardants. used as lubricant additive, adhesive and some organic synthesis intermediates. For the synthesis of pesticides omethoate, methyl phosphorus and herbicide glyphosate. This product is an important intermediate of solid glyphosate, trichlorfon, dichlorvos, rice blast, omethoate and other pesticides; It is also used in the production of organic phosphoric acid corrosion inhibitor, plastic additives, dye additives and flame retardants. |
| production method | is obtained by reacting methanol with phosphorus trichloride. The preparation method is obtained by direct reaction of methanol with phosphorus trichloride. 3CH3OH + PCl3 →(CH3O)2POH + 2HCl + CH3Cl the traditional domestic process is divided pot drop, intermittent operation. Since the reaction is a severe exothermic reaction, the reaction speed is fast and the reaction is completed instantaneously, the operation is frequent, the labor intensity is high, the production cycle is long, the equipment utilization rate is low, and the production capacity is limited. On this basis, the continuous production process is realized through process transformation, the total yield is more than 80% (based on phosphorus trichloride), and the content is more than 95%. The key in the continuous process is to make the phosphorus trichloride and methanol in full contact, and the jet reactor can be used to meet this requirement. The content of crude dimethyl phosphite obtained by continuous synthesis deacidification is about 70%, and the acidity is about 10%. It needs further neutralization with ammonia, and the protective agent dichloroethane needs to be added in the neutralization process. The neutralized by-product ammonium chloride can be reused for fertilizer use, and the dichloroethane can be recycled by distillation under reduced pressure. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 02:00:12
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