 | |
| Names | |
|---|---|
| Preferred IUPAC name Methylphosphonous dichloride | |
| Other names Methyl phosphonous dichloride, Dichloromethylphosphine, SW[1] | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.010.575 |
| EC Number |
|
| UN number | 2845 |
| |
| |
| Properties | |
| CH3Cl2P | |
| Molar mass | 116.91 g·mol−1 |
| Appearance | Colorless liquid |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Methyldichlorophosphine (alternatively known asdichloro(methyl)phosphane, SW andmethylphosphonous dichloride) is anorganophosphorus compound with the chemical formula CH3PCl2. It is a colorless, corrosive, flammable, and highly reactive liquid with a pungent odor.
Methyldichlorophosphine is produced by alkylation ofphosphorus trichloride withmethyl iodide followed by reduction of the resulting phosphonium salt with iron powder:[2][3]
The compound is an intermediate for the synthesis of other chemicals for instancedimethylphenylphosphine.
Methyldichlorophosphine belongs to the group of halophosphines, some of which are used as intermediates in the production of plant protection agents, stabilizers for plastics, and catalysts. It is a precursor of the herbicideGlufosinate. It is also used in the production offlameproofing compounds.[4]
Due to the recycling problem ofphosphoryl chloride, SW was adopted in step three of theDMHP process in the preparation ofSarin.[5] SW was also adopted as a standard precursor to V agents, having been used to prepareQL for unitary and binaryVX. SW was the first agent adopted to prepare VX in one pot reaction by aqueous medium.[6]
It is also toxic if inhaled, can cause burns upon contact with the skin and eyes, and releases fumes ofhydrochloric acid in moist environments.[7]