Names | |
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IUPAC name
9-(2,6,6-Trimethylbicyclo[3.1.1]hept-3-yl)-9-bora-bicyclo[3.3.1]nonane
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Other names
Alpine-Borane; B-Isopinocampheyl-9-borabicyclo[3.3.1]nonane; B-3-Pinanyl-9-borabicyclo[3.3.1]nonane
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Identifiers | |
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3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.157.575 |
PubChem CID
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Properties | |
C18H31B | |
Molar mass | 258.26 g·mol−1 |
Appearance | Colorless liquid |
Density | 0.947 g/mL |
Boiling point | > 55 °C (131 °F; 328 K) |
Hazards | |
GHS pictograms | |
GHS signal word | Danger |
H250 | |
P210, P222, P280, P302+334, P370+378, P422 | |
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 ?) | (|
Infobox references | |
Alpine borane is the commercial name for an organoboron compound that is used in organic synthesis. It is a colorless liquid, although it is usually encountered as a solution.
This reagent is generated by treating 9-BBN with α-pinene.
This sterically crowded chiral trialkylborane can stereoselectively reduce ketones, aldehydes, even deutero aldehydes in what is known as the Midland Alpine Borane Reduction, or simply the Midland Reduction:
Hydrolysis of the resulting borinic ester affords the alcohol:
It is also effective for the stereoselective reduction of certain acetylenic ketones.
A range of alkyl-substituted borane are specialty reagents in organic synthesis. Two such reagents that are closely related to Alpine borane are 9-BBN and diisopinocampheylborane.