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'''1,2-Dibromoethane''', also known as '''ethylene dibromide''' ('''EDB'''), is an ] with the ] {{chem|C|2|H|4|Br|2}}. Although trace amounts occur naturally in the ], where it is probably formed by ] and ], it is mainly synthetic. It is a dense colorless liquid with a faint, sweet odor, detectable at 10 ppm, and is a widely used and sometimes-controversial ].<ref name=Ullmann/> The combustion of 1,2-dibromoethane produces ] gas that is significantly corrosive.<ref name=":0">{{Cite web|url=https://www.sigmaaldrich.com|title=Safety Data Sheet for CAS-No.:106-93-4 Ethylene dibromide}}</ref> '''1,2-Dibromoethane''', also known as '''ethylene dibromide''' ('''EDB'''), is an ] with the ] {{chem|C|2|H|4|Br|2}}. Although trace amounts occur naturally in the ], where it is probably formed by ] and ], substantial amounts are produced industrially. It is a dense colorless liquid with a faint, sweet odor, detectable at 10 ppm. It is a widely used and sometimes-controversial ].<ref name=Ullmann/> The combustion of 1,2-dibromoethane produces ] gas that is significantly corrosive.<ref name=":0">{{Cite web|url=https://www.sigmaaldrich.com|title=Safety Data Sheet for CAS-No.:106-93-4 Ethylene dibromide}}</ref>


==Preparation and use== ==Preparation and use==
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===Pesticide=== ===Pesticide===
It has been used as a ] in ] and on various crops. The applications were initiated after the forced retirement of ] (DBCP).<ref name=Ullmann>{{Ullmann | author = Dagani, M. J. | author2 = Barda, H. J. | author3 = Benya, T. J. | author4 = Sanders, D. C. | title = Bromine Compounds | doi = 10.1002/14356007.a04_405}}</ref> Most of these uses have been stopped in the U.S. It continues to be used as a ] for treatment of logs for ]s and ]s, and for control of ]s in ].<ref name="www.atsdr.cdc.gov">{{cite web | url = http://www.atsdr.cdc.gov/toxprofiles/tp37.pdf | title = Toxicological Profile for 1,2-Dibromoethane | access-date = 2009-11-22 | archive-url = https://web.archive.org/web/20091122182238/http://www.atsdr.cdc.gov/toxprofiles/tp37.pdf | archive-date = 2009-11-22}}</ref> It has been used as a ] in ] and on various crops. The applications were initiated after the forced retirement of ] (DBCP).<ref name=Ullmann>{{cite book| doi = 10.1002/14356007.a04_405.pub2| chapter = Bromine Compounds| title = Ullmann's Encyclopedia of Industrial Chemistry| date = 2013| last1 = Yoffe| first1 = David| last2 = Frim| first2 = Ron| last3 = Ukeles| first3 = Shmuel D.| last4 = Dagani| first4 = Michael J.| last5 = Barda| first5 = Henry J.| last6 = Benya| first6 = Theodore J.| last7 = Sanders| first7 = David C.| pages = 1–31| isbn = 978-3-527-30385-4}}</ref> Most of these uses have been stopped in the U.S. It continues to be used as a ] for treatment of logs for ]s and ]s, and for control of ]s in ].<ref name="www.atsdr.cdc.gov">{{cite web | url = http://www.atsdr.cdc.gov/toxprofiles/tp37.pdf | title = Toxicological Profile for 1,2-Dibromoethane | access-date = 2009-11-22 | archive-url = https://web.archive.org/web/20091122182238/http://www.atsdr.cdc.gov/toxprofiles/tp37.pdf | archive-date = 2009-11-22}}</ref>


===Reagent=== ===Reagent===
1,2-Dibromoethane has wider applications in the preparation of other organic compounds including those carrying modified diazocine rings<ref>{{Cite journal|author1=Hamada, Y.|author2= Mukai. S.|date=1996|title=Synthesis of ethano-Tröger's base, configurationally stable substitute of Tröger's base |journal=Tetrahedron Asymmetry|volume=7|issue=9|pages=2671–2674|doi=10.1016/0957-4166(96)00343-6}}</ref> and vinyl bromide that is a precursor to some ]s.<ref name=Ullmann/> 1,2-Dibromoethane has wider applications in the preparation of other organic compounds including those carrying modified diazocine rings<ref>{{Cite journal|author1=Hamada, Y.|author2= Mukai. S.|date=1996|title=Synthesis of ethano-Tröger's base, configurationally stable substitute of Tröger's base |journal=Tetrahedron Asymmetry|volume=7|issue=9|pages=2671–2674|doi=10.1016/0957-4166(96)00343-6}}</ref> and vinyl bromide that is a precursor to some ]s.<ref name=Ullmann/>


In ], 1,2-dibromoethane is used as a source of bromine to brominate ]s and to activate ] for certain ]s. In the latter process, 1,2-dibromoethane reacts with magnesium, producing ] and ], and exposes a freshly etched portion of magnesium to the substrate.<ref>{{ cite encyclopedia | author = Maynard, G. D. | chapter = 1,2-Dibromoethane | encyclopedia = Encyclopedia of Reagents for Organic Synthesis | editor = Paquette, L. | year = 2004 | publisher = J. Wiley & Sons | location = New York | doi = 10.1002/047084289X.rd039 | isbn = 0471936235}}</ref> In ], 1,2-dibromoethane is used to brominate ]s and to activate ] for certain ]s. In the latter process, 1,2-dibromoethane reacts with magnesium, producing ] and ], which are innocuous, exposing a more active portion of the magnesium particle to the substrate.<ref>{{ cite encyclopedia | author = Maynard, G. D. | chapter = 1,2-Dibromoethane | encyclopedia = Encyclopedia of Reagents for Organic Synthesis | editor = Paquette, L. | year = 2004 | publisher = J. Wiley & Sons | location = New York | doi = 10.1002/047084289X.rd039 | isbn = 0471936235}}</ref>


==Health effects== ==Health effects==

Latest revision as of 15:19, 2 May 2024

1,2-Dibromoethane
Skeletal formula of 1,2-dibromoethane
Skeletal formula of 1,2-dibromoethane
Skeletal formula of 1,2-dibromoethane with all explicit hydrogens added
Skeletal formula of 1,2-dibromoethane with all explicit hydrogens added
Spacefill model of 1,2-dibromoethane
Names
Preferred IUPAC name 1,2-Dibromoethane
Other names
  • Ethylene dibromide
  • Ethylene bromide
  • Glycol bromide
  • Di(bromomethyl)
Identifiers
CAS Number
3D model (JSmol)
Abbreviations EDB
Beilstein Reference 605266
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.003.132 Edit this at Wikidata
EC Number
  • 203-444-5
KEGG
MeSH Ethylene+Dibromide
PubChem CID
RTECS number
  • KH9275000
UNII
UN number 1605
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C2H4Br2/c3-1-2-4/h1-2H2Key: PAAZPARNPHGIKF-UHFFFAOYSA-N
SMILES
  • BrCCBr
Properties
Chemical formula C2H4Br2
Molar mass 187.862 g·mol
Appearance Colorless liquid
Odor faintly sweet
Density 2.18 g mL
Melting point 9.4 to 10.2 °C; 48.8 to 50.3 °F; 282.5 to 283.3 K
Boiling point 129 to 133 °C; 264 to 271 °F; 402 to 406 K
Solubility in water 0.4% (20 °C)
log P 2.024
Vapor pressure 1.56 kPa
Henry's law
constant (kH) 		14 μmol Pa kg
Refractive index (nD) 1.539
Thermochemistry
Heat capacity (C) 134.7 J K mol
Std molar
entropy (S298) 		223.30 J K mol
Std enthalpy of
combustion (ΔcH298) 		−1.2419–−1.2387 MJ mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards carcinogen
GHS labelling:
Pictograms GHS06: Toxic GHS08: Health hazard GHS09: Environmental hazard
Signal word Danger
Hazard statements H301, H311, H315, H319, H331, H335, H350, H411
Precautionary statements P261, P273, P280, P301+P310, P305+P351+P338
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3 0 0
Flash point 104 °C (219 °F; 377 K)
Lethal dose or concentration (LD, LC):
LD50 (median dose)
  • 55.0 mg kg (oral, rabbit)
  • 79.0 mg kg (oral, chicken)
  • 110.0 mg kg (oral, guinea pig)
  • 130.0 mg kg (oral, quail)
  • 300.0 mg kg (dermal, rabbit)
LC50 (median concentration) 1831 ppm (rat, 30 min)
691 ppm (rat, 1 hr)
LCLo (lowest published) 200 ppm (rat, 8 hr)
400 ppm (guinea pig, 3 hr)
NIOSH (US health exposure limits):
PEL (Permissible) TWA 20 ppm C 30 ppm 50 ppm
REL (Recommended) Ca TWA 0.045 ppm C 0.13 ppm
IDLH (Immediate danger) Ca
Related compounds
Related alkanes
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

1,2-Dibromoethane, also known as ethylene dibromide (EDB), is an organobromine compound with the chemical formula C
2H
4Br
2. Although trace amounts occur naturally in the ocean, where it is probably formed by algae and kelp, substantial amounts are produced industrially. It is a dense colorless liquid with a faint, sweet odor, detectable at 10 ppm. It is a widely used and sometimes-controversial fumigant. The combustion of 1,2-dibromoethane produces hydrogen bromide gas that is significantly corrosive.

Preparation and use

It is produced by the reaction of ethylene gas with bromine, in a classic halogen addition reaction:

CH2=CH2 + Br2 → BrCH2–CH2Br

Historically, 1,2-dibromoethane was used as a component in anti-knock additives in leaded fuels. It reacts with lead residues to generate volatile lead bromides, thereby preventing fouling of the engine with lead deposits.

Pesticide

It has been used as a pesticide in soil and on various crops. The applications were initiated after the forced retirement of 1,2-dibromo-3-chloropropane (DBCP). Most of these uses have been stopped in the U.S. It continues to be used as a fumigant for treatment of logs for termites and beetles, and for control of moths in beehives.

Reagent

1,2-Dibromoethane has wider applications in the preparation of other organic compounds including those carrying modified diazocine rings and vinyl bromide that is a precursor to some fire retardants.

In organic synthesis, 1,2-dibromoethane is used to brominate carbanions and to activate magnesium for certain Grignard reagents. In the latter process, 1,2-dibromoethane reacts with magnesium, producing ethylene and magnesium bromide, which are innocuous, exposing a more active portion of the magnesium particle to the substrate.

Health effects

1,2-Dibromoethane causes changes in the metabolism and severe destruction of living tissues. The known empirical LD50 values for 1,2-dibromoethane are 140 mg kg (oral, rat), and 300.0 mg kg (dermal, rabbit). 1,2-Dibromoethane is a known carcinogen, with pre-1977 exposure levels ranking it as the most carcinogenic substance on the HERP Index.

The effects on people of breathing high levels are not known, but animal studies with short-term exposures to high levels caused depression and collapse, indicating effects on the brain. Changes in the brain and behavior were also seen in young rats whose male parents had breathed 1,2-dibromoethane, and birth defects were observed in the young of animals that were exposed while pregnant. 1,2-Dibromoethane is not known to cause birth defects in humans. Swallowing has caused death at 40ml doses.

References

  1. ^ "Front Matter". Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 657. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
  2. ^ NIOSH Pocket Guide to Chemical Hazards. "#0270". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ "Ethylene dibromide". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  4. ^ Yoffe, David; Frim, Ron; Ukeles, Shmuel D.; Dagani, Michael J.; Barda, Henry J.; Benya, Theodore J.; Sanders, David C. (2013). "Bromine Compounds". Ullmann's Encyclopedia of Industrial Chemistry. pp. 1–31. doi:10.1002/14356007.a04_405.pub2. ISBN 978-3-527-30385-4.
  5. ^ "Safety Data Sheet for CAS-No.:106-93-4 Ethylene dibromide".
  6. "Preparation and purification of 1,2-dibromoethane" (PDF). Synlett. 28: 49–51. 2017.
  7. Seyferth, D. (2003). "The Rise and Fall of Tetraethyllead. 2". Organometallics. 22 (25): 5154–5178. doi:10.1021/om030621b.
  8. ^ "Toxicological Profile for 1,2-Dibromoethane" (PDF). Archived from the original (PDF) on 2009-11-22. Retrieved 2009-11-22.
  9. Hamada, Y.; Mukai. S. (1996). "Synthesis of ethano-Tröger's base, configurationally stable substitute of Tröger's base". Tetrahedron Asymmetry. 7 (9): 2671–2674. doi:10.1016/0957-4166(96)00343-6.
  10. Maynard, G. D. (2004). "1,2-Dibromoethane". In Paquette, L. (ed.). Encyclopedia of Reagents for Organic Synthesis. New York: J. Wiley & Sons. doi:10.1002/047084289X.rd039. ISBN 0471936235.
  11. "Ranking Possible Cancer Hazards from Rodent Carcinogens" (PDF). Archived from the original (PDF) on 2019-06-29.
  12. "Toxic Substances Portal – 1,2-Dibromoethane".

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