cis-1,2-Dimethyldiborane
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trans-1,2-Dimethyldiborane
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Names | |
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Preferred IUPAC name
1,2-Dimethyldiborane(6) | |
Other names
Symmetrical dimethyldiborane
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Identifiers | |
3D model (JSmol)
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Properties | |
(CH3BH2)2 | |
Molar mass | 55.72 g mol−1 |
Appearance | Colorless gas |
Melting point | −124.9 °C (−192.8 °F; 148.2 K) |
Boiling point | 4 °C (39 °F; 277 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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1,2-Dimethyldiborane is an organoboron compound with the formula [(CH3)BH2]2. Structurally, it is related to diborane, but with methyl groups replacing terminal hydrides on each boron. It is the dimer of methylborane, CH3BH2, the simplest alkylborane.[1] 1,2-Dimethyldiborane can exist in a cis- and a trans arrangement.[2] 1,2-Dimethyldiborane is an easily condensed, colorless gas that ignites spontaneously in air.
An isomer of 1,2-dimethyldiborane is 1,1-dimethyldiborane, known as unsymmetrical dimethyldiborane, which has two methyl groups on one boron atom. Other methylated versions of diborane including methyldiborane, trimethyldiborane, tetramethyldiborane. Trimethylborane exists as a monomer.