Methyldiborane
Methyldiborane, CH3B2H5, or monomethyldiborane is the simplest of alkyldiboranes, consisting of a methyl group substituted for a hydrogen in diborane. As with other boranes it exists in the form of a dimer with a twin hydrogen bridge that uses three-center two-electron bonding between the two boron atoms, and can be imagined as methyl borane (CH3BH2) bound to borane (BH3). Other combinations of methylation occur on diborane, including 1,1-dimethylborane, 1,2-dimethyldiborane, trimethyldiborane, tetramethyldiborane, and trimethylborane (which is not a dimer). At room temperature the substance is at equilibrium between these molecules.
| Names | |
|---|---|
| IUPAC name
Methyldiborane | |
| Other names
monomethyldiborane methylated diborane boraethane | |
| Identifiers | |
3D model (JSmol) |
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CompTox Dashboard (EPA) |
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| Properties | |
| CH 3BH 3BH 2 | |
| Molar mass | 41.70 g mol−1 |
| Appearance | Colorless gas |
| Density | 0.546 at -126° |
| Boiling point | −43 °C (−45 °F; 230 K) |
| Related compounds | |
| dimethyldiborane trimethyldiborane tetramethyldiborane trimethylborane ethyldiborane | |
Related compounds |
Diborane |
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 | |
The methylboranes were first prepared by H. I. Schlesinger and A. O. Walker in the 1930s.
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