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From Wikipedia, the free encyclopedia
Preferred IUPAC name
Ethylarsonous dichloride
Other names
Dichloroethylarsane; DICK
3D model (JSmol)
ECHA InfoCard 100.009.019 Edit this at Wikidata
EC Number
  • 209-919-3
RTECS number
  • CH3500000
UN number 1892
  • InChI=1S/C2H5AsCl2/c1-2-3(4)5/h2H2,1H3
  • CC[As](Cl)Cl
Molar mass 174.8893 g/mol
Appearance Colorless, mobile liquid
Density 1.742 @ 14 °C
Melting point −65 °C (−85 °F; 208 K)
Boiling point 156 °C (313 °F; 429 K) (decomposes)
Soluble in alcohol, benzene, ether, and water
Occupational safety and health (OHS/OSH):
Main hazards
Highly toxic, irritant
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ethyldichloroarsine, sometimes abbreviated as "ED" and "CY" and also known as ethyl Dick,[1] is an organoarsenic compound with the formula CH3CH2AsCl2. This colourless volatile liquid is a highly toxic obsolete vesicant or blister agent that was used during World War I in chemical warfare.[2] The molecule is pyramidal with the Cl-As-Cl and C-As-Cl angles approaching 90° (see image). Ethyldichloroarsine has high chronic toxicity, similar to lewisite.[3]


  1. ^ Wood JR (May 1944). "Chemical Warfare-A Chemical and Toxicological Review". American Journal of Public Health and the Nation's Health. 34 (5): 455–60. doi:10.2105/AJPH.34.5.455. PMC 1625133. PMID 18015982.
  2. ^ "Methyldichloroarsine". NorthShore University HealthSystem. Archived from the original on March 7, 2011.
  3. ^ Okumura A, Takada Y, Watanabe S, Hashimoto H, Ezawa N, Seto Y, et al. (July 2016). "In-Line Reactions and Ionizations of Vaporized Diphenylchloroarsine and Diphenylcyanoarsine in Atmospheric Pressure Chemical Ionization Mass Spectrometry". Journal of the American Society for Mass Spectrometry. 27 (7): 1219–26. Bibcode:2016JASMS..27.1219O. doi:10.1007/s13361-016-1394-0. PMID 27098411.