EA-1763,[1] O-PPVX, V1[2] or propyl S-2-diisopropylaminoethylmethylphosphonothiolate, is a military-grade neurotoxic organophosphonate nerve agent related to VX as it the propyl analogue of VX. It is part of the V-series.
 | |
| Names | |
|---|---|
| Other names N-[2-[methyl(propoxy)phosphoryl]sulfanylethyl]-N-propan-2-ylpropan-2-amine | |
| Identifiers | |
3D model (JSmol) | |
PubChem CID | |
| |
| |
| Properties | |
| C12H28NO2PS | |
| Molar mass | 281.39 g·mol−1 |
| Boiling point | 316.5 °C (601.7 °F; 589.6 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Chemical characteristics
Little information about EA-1763's physicochemical properties has been reported.[1] V1 is a more viscous and less dense liquid than VX.[3] It is colorless, odorless and tasteless in its pure form. Impure, or in the crude form, it has a characteristic viscous amber color, giving it an appearance similar to motor oil. The impure form varies several shades of amber, from a viscous liquid of a transparent pale yellow color to a pasty liquid of a semi-transparent and cloudy dirty amber color. The smell varies from engine oil to an offensive brew of organosulfur compounds and organoamines.[4]
Its larger alkane chain pushes its melting point above that of VX. The estimated solubility of V1 in water is 4 times lower compared to VX (6.8 g/L of water at 25 °C). V1 has high solubility in organic solvents and other non-polar compounds. The stability of V1 is roughly the same as that of VX in either environment. Higher insolubility and lower volatility can slow down the process. A vapor pressure at least 3 times lower than VX is speculated.[5]
The longer alkane chain tends to stabilize the induction of electrons from P to O, making P less electrophilic.[5] It is expected that the persistence of V1 is slightly higher than that of VX, estimating the hydrolysis rate between ethyl and n-propyl paraoxon, is 1.6 times more persistent in neutral medium.[6]
The lower volatility and minimal persistence difference makes VX preferable to V1.[5]
Preparation
It is prepared by the same route as VX using propanol instead of ethanol.