Triethylborane
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| Names | |||
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IUPAC name
Triethylborane
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| Other names
triethylborine, triethylboron
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| Identifiers | |||
97-94-9 
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| 3D model (Jmol) | Interactive image | ||
| ChemSpider |
7079
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| ECHA InfoCard | 100.002.383 | ||
| EC Number | 202-620-9 | ||
| PubChem | 7357 | ||
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| Properties | |||
| C6H15B | |||
| Molar mass | 98.00 g/mol | ||
| Appearance | Colorless to pale yellow liquid | ||
| Density | 0.677 g/cm3 | ||
| Melting point | −93 °C (−135 °F; 180 K) | ||
| Boiling point | 95 °C (203 °F; 368 K) | ||
| N/A, Highly reactive | |||
| Hazards | |||
| Main hazards | Spontaneously flammable in air; causes burns | ||
| Safety data sheet | External MSDS | ||
| R-phrases | R11 R14/15 R17 R19 R34 R35 R36/37 | ||
| S-phrases | S6 S7/8 S16 S33 S36/37/39 S43A S45 S29 | ||
| Flash point | < −20 °C (−4 °F; 253 K) | ||
| −20 °C (−4 °F; 253 K) | |||
| Related compounds | |||
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Related compounds
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Tetraethyllead Diborane Sodium tetraethylborate trimethylborane |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is  ?) |
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| Infobox references | |||
Triethylborane (TEB), also called triethylboron, is an organoborane (a compound with a B-C bond). It is a colorless pyrophoric liquid. Its chemical formula is (C2H5)3B, abbreviated Et3B. It is soluble in organic solvents tetrahydrofuran and hexane.
Triethylborane is prepared by the reaction of trimethyl borate with triethylaluminium:
The molecule is monomeric, unlike H3B and Et3Al, which tend to dimerize. It has a planar BC3 core.
Triethylborane was used to ignite the JP-7 fuel in the Pratt & Whitney J58 turbojet/ramjet engines powering the Lockheed SR-71 Blackbird spy plane, and its predecessor A-12 OXCART. Triethylborane is suitable for this because of its pyrophoric properties, especially the fact that it burns with very high temperature. It was chosen as an ignition method for reliability reasons, and in the case of the Blackbird, because the JP-7 fuel has very low volatility and is difficult to ignite. Conventional ignition plugs posed too high risk of a malfunction. It was used to start up each engine and to light the afterburners.
Mixed with 10-15% triethylaluminium, it was used before lift-off to ignite the F-1 engines on the Saturn V rocket.
The SpaceX Falcon 9 rocket also uses a triethylaluminium-triethylborane mixture as a first and second stage ignitor.
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