Dibromomethane
Stereo skeletal formula of dibromomethane eith all explicit hydrogens added | |
Spacefill model for dibromomethane | |
Names | |
---|---|
IUPAC name
Dibromomethane[1]
|
|
Other names
|
|
Identifiers | |
74-95-3 | |
Abbreviations |
|
969143 | |
ChEBI | CHEBI:47077 |
ChemSpider | 2916 |
EC Number | 200-824-2 |
25649 | |
Jmol 3D model | Interactive image |
MeSH | methylene+bromide |
PubChem | 3024 |
RTECS number | PA7350000 |
UN number | 2664 |
|
|
|
|
Properties | |
CH2Br2 | |
Molar mass | 173.84 g·mol−1 |
Appearance | Colorless liquid |
Density | 2.477 g mL−1 |
Melting point | −52.70 °C; −62.86 °F; 220.45 K |
Boiling point | 96 to 98 °C; 205 to 208 °F; 369 to 371 K |
12.5 g L−1 (at 20 °C) | |
Vapor pressure | 4.65 kPa (at 20.0 °C) |
Henry's law
constant (kH) |
9.3 μmol Pa−1 kg−1 |
Refractive index (nD)
|
1.541 |
Thermochemistry | |
104.1 J K−1 mol−1 | |
Vapor pressure | {{{value}}} |
Related compounds | |
Related alkanes
|
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
|
verify (what is ?) | |
Infobox references | |
Dibromomethane or methylene bromide, or methylene dibromide is a halomethane. It is slightly soluble in water but very soluble in carbon tetrachloride, diethyl ether and methanol. Its refractive index is 1.5419 (20 °C, D).
Preparation
Dibromomethane can be prepared from bromoform by reaction
- CHBr3 + Na3AsO3 + NaOH → CH2Br2 + Na3AsO4 + NaBr
using sodium arsenite and sodium hydroxide.[2]
Another way is to prepare it from diiodomethane and bromine.
Uses
Dibromomethane is used as a solvent, gauge fluid, and in organic synthesis. It is a convenient agent for converting catechols to their methylenedioxy- derivatives.
Natural occurrence
It is naturally produced by marine algae and liberated to the oceans. Releasing on soil causes it to evaporate and leach into the ground. Releasing in water causes it to be lost mainly by volatilisation with a half life of 5.2 hours. It has no significant degradating biological or abiological effects. In the atmosphere it will be lost because of reaction with photochemically produced hydroxyl radicals. The estimated half life of this reaction is 213 days.
References
- Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Methylene bromide preparation