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IUPAC name 2-chloro-N-(2-chloroethyl)-N-ethyl-ethanamine; Compound 4644; ethyl-bis(-2-chloroethyl)amine; Bis-(2-chloroethyl)amine; HN1
CAS number 538-07-8
Molecular formula C6H13Cl2N
Molar mass 170.08 g mol−1
Density 1.0861 g/cm3 at 20°C, 1.09 at 25°C
Melting point


Boiling point

85.5°C, 194°C decomposes

Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Bis(2-chloroethyl)ethylamine is the organic compound with the formula C2H5N(CH2CH2Cl)2. Often abbreviated HN1, it is a powerful vesicant and a so-called nitrogen mustard gas (it is not a gas) used for chemical warfare. HN-1 was developed in the 1920s and 1930s to remove warts and later as a military agent.

Mode of action

Nitrogen mustards react via an initial cyclization to the corresponding iminium salt. The rate of this reaction is pH dependent because the protonated amine cannot cyclize. The iminium ion reacts with water in a slower reaction. At pH 8, the nitrogen mustards are essentially quantitatively converted to the iminium ion for subsequent slow reaction with water. In contrast, at pH 4 cyclization and hydrolysis show the classic form of reactions in series.


    This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Bis(2-chloroethyl)ethylamine". A list of authors is available in Wikipedia.
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