3D model (JSmol)
|Molar mass||187.86 g·mol−1|
|Density||2.18 g mL−1|
|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|
|0.4% (20 °C)|
|Vapor pressure||1.56 kPa|
|14 μmol Pa kg−1|
Refractive index (nD)
Heat capacity (C)
|134.7 J K−1 mol−1|
|223.30 J K−1 mol−1|
Std enthalpy of
|−1.2419–−1.2387 MJ mol−1|
|GHS signal word||DANGER|
|H301, H311, H315, H319, H331, H335, H350, H411|
|P261, P273, P280, P301+310, P305+351+338|
|Flash point||> 104 °C (219 °F; 377 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
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)
|US health exposure limits (NIOSH):|
|TWA 20 ppm C 30 ppm 50 ppm [5-minute maximum peak]|
|Ca TWA 0.045 ppm C 0.13 ppm [15-minute]|
IDLH (Immediate danger)
|Ca [100 ppm]|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
1,2-Dibromoethane, also known as ethylene dibromide (EDB), is the organobromine compound with the chemical formula (CH2Br)2. Although trace amounts occur naturally in the ocean, where it is formed probably by algae and kelp, it is mainly synthetic. It is a colorless liquid with a sweet odor, detectable at 10 ppm, is a widely used and sometimes-controversial fumigant.
Preparation and use
- CH2=CH2 + Br2 → BrCH2CH2Br
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.
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, for control of moths in beehives.
In the laboratory, 1,2-dibromoethane is used in organic synthesis as a source of bromine, e.g., to brominate carbanions and to activate magnesium for certain Grignard reagents. In the latter process, the 1,2-dibromoethane is converted to ethylene and magnesium bromide, exposing a freshly etched portion of magnesium to the substrate.
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 40 mL doses.
- "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.
- "NIOSH Pocket Guide to Chemical Hazards #0270". National Institute for Occupational Safety and Health (NIOSH).
- "Ethylene dibromide". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
- Dagani, M. J.; Barda, H. J.; Benya, T. J.; Sanders, D. C., "Bromine Compounds", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a04_405
- Seyferth, D. (2003). "The Rise and Fall of Tetraethyllead. 2". Organometallics. 22 (25): 5154–5178. doi:10.1021/om030621b.
- "Toxicological Profile for 1,2-Dibromoethane" (PDF). Archived from the original (PDF) on 2009-11-22. Retrieved 2009-11-22.
- Maynard, G. D. (2004). "1,2-Dibromoethane". In L. Paquette. Encyclopedia of Reagents for Organic Synthesis. New York: J. Wiley & Sons. doi:10.1002/047084289 (inactive 2018-10-20).
- "ATSDR - Medical Management Guidelines (MMGs): 1,2-Dibromoethane".
- "Ranking Possible Cancer Hazards on the HERP Index" (PDF). Archived from the original (PDF) on 2011-05-11. Retrieved 2010-10-14.