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Structural formula
Structure of dibenzoxazepine
Surname Dibenzoxazepine
other names
  • Dibenzo [ b , f ] [1,4] oxazepine ( IUPAC )
  • CR
Molecular formula C 13 H 9 NO
Brief description

flammable yellow solid

External identifiers / databases
CAS number 257-07-8
EC number 607-782-8
ECHA InfoCard 100.114.990
PubChem 9213
ChemSpider 8858
Wikidata Q417922
Molar mass 195.22 g · mol -1
Physical state



0.9641 g cm −3 at 100 ° C

Melting point

72 ° C

boiling point

222 ° C

  • very little soluble in water (80 mg / l at 20–25 ° C)
  • soluble in ethyl alcohol and ether
safety instructions
GHS labeling of hazardous substances
06 - Toxic or very toxic 08 - Dangerous to health 09 - Dangerous for the environment


H and P phrases H: 301-315-317-332-335-373-410
P: 260-264-272-273-280-301 + 310-302 + 352-304 + 340-312-314-330-332 + 313-333 + 313-362 + 364-391
Toxicological data
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Dibenzoxazepine ( CR ) is a tear gas that was first produced in 1962. It was developed by the Swiss pharmaceutical company Geigy in the early 1960s and introduced as a police weapon by the British government in 1973. It is only used by the British police or individual military special forces. The systematic chemical name of the substance is dibenzo [ b , f ] [1,4] oxazepine. It is also sometimes referred to as CR gas .

CR is included on the Common Military List under the European Union Code of Conduct on Arms Exports.

Effect and safety information

CR is a chemical weapon and attacks the eyes ( eye warfare agent ) as well as skin and mucous membranes. Prolonged blindness can occur with direct contact with the eye. Elevated blood pressure and hysterical attacks as a result of contamination are possible. The symptoms usually last longer. In high concentrations (e.g. in closed rooms) it is fatal.

The vapors or aerosols of the substance cause stinging of the eyes, mucous membranes and tongue, heavy discharge of tears, saliva and nasal discharge and coughing up to attacks of suffocation. Affected eyes and mucous membranes can be rinsed with a 4% sodium hydrogen carbonate solution . Contact with water or on damp skin can cause redness and severe pain, which is why showering or bathing should be avoided for the first six hours after contamination with the irritant. The symptoms usually subside after 30 minutes. Carcinogenic effects have been demonstrated in mice , with lung and liver tumors developing after exposure to the airways for several weeks.

See also

Individual evidence

  1. a b c d e f g h i Günter Hommel: Handbook of dangerous goods. Volume 6 Springer Berlin Heidelberg, 2012, ISBN 978-3-642-25051-4 , p. 2317.
  2. a b CaymanChem: cypermethrin , accessed on 27 December of 2019.
  3. a b c Entry on dibenzoxazepine. In: Römpp Online . Georg Thieme Verlag, accessed on May 13, 2011.
  4. Official Journal of the European Communities: Declaration of the Council of June 13, 2000 on the occasion of the establishment of the common list of military equipment within the framework of the European Union Code of Conduct for Arms Exports (PDF) , (2000 / C 191/01).