Overview

2,2′-dichlorodiethyl sulfide (two-two-prime-di-KLO-ro-di-ETH-el sul-fyd) is more commonly known as mustard gas. It is also known as bis-(2-chloroethyl) sulfide; sulfur mustard; yprite; and 1,1′-thiobis[2-chloroethane]. The compound occurs as a yellowish liquid that, in a pure form, has no odor. Small amounts of impurities give it the distinctive odor of mustard, from which it gets its common name. It may also smell like garlic or horseradish because of impurities.

Key Facts

Other Names:

Mustard gas; see Overview for more names

Formula:

(CH₂CH₂Cl)₂S

Elements:

Carbon, hydrogen, chlorine, sulfur

Compound Type:

Organic sulfide

State:

Liquid

Molecular Weight:

159.09 g/mol

Melting Point:

13 to 14°C (55 to 57°F)

Boiling Point:

217°C (423°F)

Solubility:

Insoluble in water; soluble in alcohol, ether, acetone, benzene, and other organic solvents; soluble in fats

Mustard gas was discovered by the English physicist Frederick Guthrie (1833–1886) in 1860. While working with the compound...