Dimethyl phosphite - phosphoric acid dimethyl ether, a colorless liquid, due to the presence of impurities, which usually has an unpleasant odor and exists in the form of two tautomers (the equilibrium is shifted to the left): (CH 3 O) 2 P (O) H ↔ (CH 3 O) 2 RON . It is soluble in organic solvents and water. It slowly decomposes on storage.
| Dimethyl phosphite | |
|---|---|
| Are common | |
| Systematic name | dimethyl phosphite |
| Chem. formula | C 2 H 7 O 3 P |
| Physical properties | |
| Molar mass | 110 g / mol |
| Density | 1.1944 g / cm³ |
| Optical properties | |
| Refractive index | 1,4036 |
| Classification | |
| Reg. CAS number | |
| PubChem | |
| Reg. EINECS number | |
| Smiles | |
| Inchi | |
| RTECS | |
| Chebi | |
| ChemSpider | |
In the 31 P NMR spectrum, the chemical shift relative to 85% H 3 PO 4 is 11 ppm, the spin-spin interaction constant of the P and H nuclei is 695 Hertz; the absorption band in the IR spectrum for the P – H bond is 2427 cm – 1 .
Dimethyl phosphite is prepared by reacting PCl 3 with CH 3 OH (90% yield) or by bubbling O 2 through a mixture of phosphorus with CH 3 OH (75% yield). It is used for the synthesis of insecticides, for example, chlorophos and dichlorvos. [one]
It is included in Part B of Schedule 3 of the Convention on the Prohibition of Chemical Weapons, as it can serve as a precursor for the synthesis of organophosphorus combat substances.