2-Chlorovinyl arsine oxide

Chlorovinyl arsenous oxide 2-Chlorovinyl arsenic oxide 2-Chlorovinyl arsine oxide 2-Chloroethenyl arsinic oxide Lewisite oxide C2H2AsC10 3088-37-7 Hydrolysis or dehydration of 2-chlorovinyl arsonous acid... 

The production of two equivalents of chloride occurs within 3 min at 20°C at 5°C, the reaction is 90% complete within 2 min, and the completion of the reaction requires several hours. The hydrolysis rate constant is reported as Imin at 20°C. Hydrolysis of 2-chlorovinyl arsine oxide is slower, resulting in lewisite oxide (chlorovinyl arsenous oxide) and polymerized lewisite oxide ... 

Figure 1. 400 MhziH NMR spectra of (a) 2-chlorovinyl arsine oxide (b) products of its electrochemical destruction after bioutilization. Solvent - D2O.

Lewisite Lewisite was processed using a skid-mounted apparatus which could accept bulk liquid metered in from 1 ton cylinders. During October 1991, the agent was destroyed in a three-step neutralization process (1) conversion of lewisite to lewisite oxide (chlorovinyl arsine oxide) by addition of the agent to aqueous acidic hydrogen peroxide (2) removal... 

Lewisite [dichloro(2-chlorovinyl)arsine] is an organic arsenical known for its vesicant properties (Rosenblatt et al., 1975). It has a molecular weight of 207.32, vapor pressure of 0.58 mm HG at 25°C, a liquid density of 1,89 g/cm at 25°C, freezing point of -18°C, boiling point of 190°C, and is negligibly soluble in water (DA, 1974). The chemical structure of lewisite is shown below. Lewisite may occur as a trans-isomer and as a cis-isomer. In aqueous solutions, the cis-isomer undergoes photoconversion to the trans-isomer (Clark, 1989). hi the presence of moisture, lewisite is rapidly converted to the more stable but highly toxic lewisite oxide (2-chlorovinylarsenous acid) (Cameron et al., 1946). 

Although Lewisite is only slightly soluble in water (0.5 g L j [123], hydrolysis is rapid and results in the formation of the water-soluble dihydroxy arsine (2-chlorovinyl arsonous acid). In basic solution, the traws-Lewisite isomer is cleaved by the hydroxyl ion to give acetylene and sodium arsenite this occurs even at low temperatures [79, 123]. ds-Lewisite must be heated to over 40°C to react with NaOH to yield vinyl chloride, sodium arsenite and acetylene. In aqueous solution, the ds-isomer undergoes a photoconversion into the tr zws-isomer. In water and in the presence of oxidizers naturally present in the environment, the toxic trivalent arsenic of Lewisite oxide is oxidized to the less toxic pentavalent arsenic [124]. Regardless of the degradation pathway, arsenical compounds will ultimately be formed. 

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