CR gas

CR gas
Names
Preferred IUPAC name
Dibenzo[b,f][1,4]oxazepine
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.114.990 Edit this at Wikidata
UNII
  • InChI=1S/C13H9NO/c1-3-7-12-10(5-1)9-14-11-6-2-4-8-13(11)15-12/h1-9H checkY
    Key: NPUACKRELIJTFM-UHFFFAOYSA-N checkY
  • InChI=1/C13H9NO/c1-3-7-12-10(5-1)9-14-11-6-2-4-8-13(11)15-12/h1-9H
    Key: NPUACKRELIJTFM-UHFFFAOYAI
  • N\1=C\c3c(Oc2c/1cccc2)cccc3
Properties
C13H9NO
Molar mass 195.221 g·mol−1
Density 1.160±0.10 g/cm3
Melting point 73 °C (163 °F; 346 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

CR gas or dibenzoxazepine (chemical name dibenz[b,f][1,4]oxazepine, is an incapacitating agent and a lachrymatory agent. CR was developed by the British Ministry of Defence as a riot control agent in the late 1950s and early 1960s. A report from the Porton Down laboratories described exposure as "like being thrown blindfolded into a bed of stinging nettles", and it earned the nickname "firegas".[1][2]

In its effects, CR gas is very similar to CS gas (o-chlorobenzylidene malononitrile), but twice as potent, even though there is little structural resemblance between the two. For example, 2 mg of dry CR causes skin redness in 10 min, 5 mg causes burning and erythremia, and 20 mg‍—‍strong pain. Water usually amplifies the pain effect of CR on skin. CR aerosols cause irritation at concentrations of 0.2 mcg/L, becoming intolerable at 3 mcg/L. The LD50 of CR through air inhalation 350 mg·min/L.[3]

  1. ^ Rosenhead, Jonathon (23 Jul 1981). "The technology of riot control". New Scientist.
  2. ^ Wright, Steve (6 January 1998). "An Appraisal of Technologies of Political Control". The STOA Programme, Directorate General for Research, European Parliament. Retrieved 3 October 2015 – via pitt.edu.
  3. ^ Aleksandroc V.N., Emelyanov V.I. Poisonous Substances: textbook / G.A. Sokolskiy, ed. Moscow. 1990. — 272 с. ISBN 5-203-00341-6.