Lewisite 2

Lewisite 2
	Lewisite 2
Names
	Preferred IUPAC name Bis[(E)-2-chloroethen-1-yl]arsinous chloride
	Other names Dichlorovinylarsine chloride; Chlorobis((E)-2-chlorovinyl)arsine; Bis[(E)-2-chlorovinyl]chloroarsine; (E, E)-Lewisite 2
Identifiers
CAS Number	50361-06-3 ;
3D model (JSmol)	Interactive image;
ChemSpider	4519503 ;
PubChem CID	5368106;
UNII	80474J4P87 ;
CompTox Dashboard (EPA)	DTXSID2074794;
	InChI InChI=1S/C4H4AsCl3/c6-3-1-5(8)2-4-7/h1-4H/b3-1+,4-2+ Key: YRFJGLQNTWLXKO-ZPUQHVIOSA-N;
	SMILES C(=C[As](C=CCl)Cl)Cl;
Properties
Chemical formula	C4H4AsCl3
Molar mass	233.35 g mol−1
Hazards
NFPA 704 (fire diamond)	4 1 1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Lewisite 2 (L-2) is an organoarsenic chemical weapon with the formula AsCl(CH=CHCl)₂. It is similar to lewisite 1 and lewisite 3 and was first synthesized in 1904 by Julius Arthur Nieuwland. It is usually found as a mixture of 2-chlorovinylarsonous dichloride (lewisite 1) as well as bis(2-chloroethenyl) arsinous chloride (lewisite 2) and tris(2-chlorovinyl)arsine (lewisite 3).