9-Borabicyclo(3.3.1)nonane

Chemical compound From Wikipedia, the free encyclopedia

9-Borabicyclo[3.3.1]nonane or 9-BBN is an organoborane compound. This colourless solid is used in organic chemistry as a hydroboration reagent. The compound exists as a hydride-bridged dimer, which easily cleaves in the presence of reducible substrates.[1] 9-BBN is also known by its nickname 'banana borane'.[2] This is because rather than drawing out the full structure, chemists often simply draw a banana shape with the bridging boron.[3][better source needed]

Quick facts Names, Identifiers ...
9-Borabicyclo[3.3.1]nonane
Names
IUPAC name
9-Borabicyclo[3.3.1]nonane
Other names
Borabicyclononane
Banana borane
Identifiers
3D model (JSmol)
Abbreviations 9-BBN
ChemSpider
ECHA InfoCard 100.005.456 Edit this at Wikidata
EC Number
  • 206-000-9
UNII
  • InChI=1S/C8H15B/c1-3-7-5-2-6-8(4-1)9-7/h7-9H,1-6H2 checkY
    Key: FEJUGLKDZJDVFY-UHFFFAOYSA-N checkY
  • InChI=1/C8H15B/c1-3-7-5-2-6-8(4-1)9-7/h7-9H,1-6H2
    Key: FEJUGLKDZJDVFY-UHFFFAOYAE
  • B1([H]3)(C2CCCC1CCC2)[H]B34C2CCCC4CCC2
Properties
C16H30B2
Molar mass 244.04 g·mol−1
Density 0.894 g/cm3
Melting point 153 to 155 °C (307 to 311 °F; 426 to 428 K)
Reacts
Hazards
GHS labelling:
GHS02: FlammableGHS05: Corrosive
Warning
H250, H260, H314
P210, P222, P223, P231+P232, P260, P264, P280, P301+P330+P331, P302+P334, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P335+P334, P363, P370+P378, P402+P404, P405, P422, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation

9-BBN is prepared by the reaction of 1,5-cyclooctadiene and borane usually in ethereal solvents, for example:[4][5]

The compound is commercially available as a solution in tetrahydrofuran and as a solid. 9-BBN is especially useful in Suzuki reactions.[6][7][8]

Its highly regioselective addition on alkenes allows the preparation of terminal alcohols by subsequent oxidative cleavage with H2O2 in aqueous KOH. The steric demand of 9-BBN greatly suppresses the formation of the 2-substituted isomer compared to the use of borane.

See also

References

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