Bis(chloromethyl) ether

Bis(chloromethyl) ether
Names
IUPAC name
bis(chloromethyl) ether
Other names
bis-CME, chloro-(chloromethoxy)methane, oxybis(chloromethane), bis-Chloromethyl ether, Chloromethyl ether, Dichlorodimethyl ether, Dichloromethyl ether
Identifiers
542-88-1
Abbreviations BCME
ChemSpider 21106500
EC Number 208-832-8
Jmol interactive 3D Image
KEGG C19158 YesY
PubChem 10967
Properties
C2H4Cl2O
Molar mass 114.95 g·mol−1
Density 1.33 g/cm3
Melting point −41.5 °C (−42.7 °F; 231.7 K)
Boiling point 106 °C (223 °F; 379 K)
reacts[1]
Vapor pressure 30 mmHg (22°C)[1]
1.4421[2]
Hazards
Main hazards carcinogen, reacts with water[1]
H225, H302, H311, H330, H350
Flash point 38 °C (100 °F; 311 K)
US health exposure limits (NIOSH):
OSHA-regulated carcinogen[1]
potential occupational carcinogen[1]
N.D.[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Bis(chloromethyl) ether is an organic compound with the chemical formula (CH2Cl)2O. It is a colourless liquid with an unpleasant suffocating odour and it is one of the chloroalkyl ethers. Bis(chloromethyl) ether was once produced on a large scale, but was found to be highly carcinogenic and thus such production has all but ceased.

Synthesis

It was produced industrially from paraformaldehyde and a mixture of chlorosulfonic acid and sulfuric acid.[3] It is also produced as a by-product in the Blanc chloromethylation reaction and is a known impurity in technical grade chloromethyl methyl ether.

Because of their carcinogenic potency, the industrial production of chloromethyl ethers ended in most countries in the early 1980s. Bis(chloromethyl) ether was no exception to this with production in the U.S.A. ending in 1982.

Uses

Bis(chloromethyl) ether has been extensively used in chemical synthesis, primarily as a crosslinking agent in the manufacture of ion-exchange resins and in the textile industry. It was also used as a linker in the synthesis of certain nerve agent antidotes (asoxime chloride, obidoxime). Bis(chloromethyl) was also effective for chloromethylation of aromatic substrates.[4]

Safety

Bis(chloromethyl) ether is carcinogenic.[5][6] It is one of 13 chemicals considered an OSHA-regulated occupational carcinogen.[7] Chronic exposure has been linked to in increased risk of lung cancer.[5]

See Also

References

  1. 1 2 3 4 5 6 "NIOSH Pocket Guide to Chemical Hazards #0128". National Institute for Occupational Safety and Health (NIOSH).
  2. ↑ Evans, L.; Gray, R. (May 1958). "Notes - Preparation of Certain Polychlorodimethyl Ethers". The Journal of Organic Chemistry 23 (5): 745–746. doi:10.1021/jo01099a602.
  3. ↑ Wilhelm Heitmann, Günther Strehlke, Dieter Mayer “Ethers, Aliphatic” Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. doi: 10.1002/14356007.a10_023
  4. ↑ Olah, George A.; Beal, David A.; Olah, Judith A. (April 1976). "Aromatic substitution. XXXVIII. Chloromethylation of benzene and alkylbenzenes with bis(chloromethyl)ether, 1,4-bis(chloromethoxy)butane, 1-chloro-4-chloromethoxybutane, and formaldehyde derivatives". The Journal of Organic Chemistry 41 (9): 1627–1631. doi:10.1021/jo00871a032.
  5. 1 2 "Bis(chloromethyl)ether (BCME) (CASRN 542-88-1)". U.S. environmental protection agency. Retrieved 26 November 2014.
  6. ↑ Van Duuren, BL (August 1989). "Comparison of potency of human carcinogens: vinyl chloride, chloromethylmethyl ether and bis(chloromethyl)ether.". Environmental research 49 (2): 143–51. doi:10.1016/s0013-9351(89)80059-3. PMID 2526731.
  7. ↑ "NIOSH Pocket Guide to Chemical Hazards: bis-Chloromethyl ether". Centers for Disease Control and Prevention. Retrieved 26 November 2014.
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