Displacement of Diborane from Pentaborane(9) by Strong Molecular Bases.
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF CHEMISTRY
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Ammonia or methylamine, reacting with pentaborane9 during sudden heating at 160-180C., can displace as much as 0.25 B2H6 per B5H9 consumed. The reason for such anomalous behavior, whereby strong molecular bases displace a strong Lewis acid, is to be found in a series of reaction steps whereby the base first disrupts the B5H9 to combine with the B4H6 and BH3 fragments then the BH3 complex makes the borazane and hydrogen next the borazane accepts a second BH3 to make a mu-aminodiborane, which finally dissociates into diborane and the borazane trimer, the latter at last going to the corresponding borazine. For all of the mentioned reactions, the B4H6 which include the bases and have high thermal stability.
- Inorganic Chemistry