Trimethyldiborane
Trimethyldiborane, (CH3)3B2H3 is a molecule containing boron carbon and hydrogen. It is an alkylborane, consisting of three methyl group substituted for a hydrogen in diborane. It can be considered a mixed dimer: (CH3)2BH2BH(CH3) or dimethylborane and methylborane. called 1,2-dimethyldiborane. Other combinations of methylation occur on diborane, including monomethyldiborane, 1,2-dimethyldiborane, tetramethyldiborane, 1,1-dimethylborane and trimethylborane. At room temperature the substance is at equilibrium between these forms, so it is difficult to keep it pure. The methylboranes were first prepared by H. I. Schlesinger and A. O. Walker in the 1930s.
| Names | |
|---|---|
| IUPAC name
1,1,2-Trimethyldiborane | |
| Other names
Trimethyldiborane(6) | |
| Identifiers | |
3D model (JSmol) |
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| Properties | |
| (CH 3) 3B 2H 3 | |
| Molar mass | 69.75 g mol−1 |
| Appearance | Colorless pyrophoric liquid |
| Melting point | −122.9 °C (−189.2 °F; 150.2 K) |
| Boiling point | 45.5 °C (113.9 °F; 318.6 K) |
| Thermochemistry | |
Std enthalpy of formation (ΔfH⦵298) |
48 kcal/mol |
| Related compounds | |
| trimethylborane tetramethyldiborane dimethyldiborane methyldiborane | |
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 | |
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