2-Bromobutane

2-Bromobutane is an isomer of 1-bromobutane. Both compounds share the molecular formula C4H9Br. 2-Bromobutane is also known as sec-butyl bromide or methylethylbromomethane. Because it contains bromine, a halogen, it is part of a larger class of compounds known as alkyl halides. It is a colorless liquid with a pleasant odor. Because the carbon atom connected to the bromine is connected to two other carbons the molecule is referred to as a secondary alkyl halide.

2-Bromobutane
Names
IUPAC name
2-Bromobutane[1]
Other names
sec-Butylbromide
Identifiers
3D model (JSmol)
505949
ChEMBL
ChemSpider
ECHA InfoCard 100.001.037
EC Number
  • 201-140-7
MeSH 2-bromobutane
RTECS number
  • EJ6228000
UNII
UN number 2339
Properties
C4H9Br
Molar mass 137.020 g·mol−1
Appearance Colourless liquid
Density 1.255 g mL−1
Melting point −112.65 °C; −170.77 °F; 160.50 K
Boiling point 91 °C; 196 °F; 364 K
log P 2.672
1.437
Thermochemistry
Std enthalpy of
formation (ΔfH⦵298)
 −156 kJ mol−1
Std enthalpy of
combustion (ΔcH⦵298)
 −2.706–−2.704 MJ mol−1
Hazards
GHS pictograms
GHS Signal word Danger
GHS hazard statements
 H225
P210
Flash point 21 °C (70 °F; 294 K)
Related compounds
Related alkanes
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

2-Bromobutane is relatively stable, but is toxic and flammable. When treated with a strong base, it is prone to undergo an E2 reaction, which is a bimolecular elimination reaction, resulting in (predominantly) 2-butene, an alkene (double bond). 2-Bromobutane is an irritant, and harmful if ingested. It can irritate and burn skin and eyes.

References
  1. "2-bromobutane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Retrieved 17 June 2012.
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