![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CH: exo-2-FB4H9 and trans-MeCH![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
CHBF2† The new fluoroboranes exo-2-FB4H9 1 and trans-MeCHCHBF2 2 have been obtained unexpectedly and in good yield from the reaction of tetramethylammonium octahydrotriborate (NMe4B3H8) with CH).
![Graphical abstract: Unexpected formation of new fluoroboranes from the reaction of NMe4B3H8 with BF3 and MeC [[triple bond, length as m-dash]] CH: exo-2-FB4H9 and trans-MeCH [[double bond, length as m-dash]] CHBF2](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=B206102C&imageInfo.ImageIdentifier.Year=2002)
![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/h2_char_e002.gif)
CH: exo-2-FB4H9 and trans-MeCH![[double bond, length as m-dash]](https://www.rsc.org/images/entities/h2_char_e001.gif)
CHBF2
M. A. Fox, R. Greatrex and D. L. Ormsby, Chem. Commun., 2002, 2052 DOI: 10.1039/B206102C
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