Chemical Studies of Closo-1, 5-Dicarbapentaborane(5).
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF CHEMISTRY
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The carborane C2B3H5 is metastable relative to polymerization, which occurs easily under high-energy conditions or when the electronic symmetry of the trigonal-bipyramidal structure is disturbed. Attempts to halogenate or NO2-oxidize C2B3H5 also produced only intractable nonvolatiles. However, highly covalent substitution derivatives are possible. The apparently stable B-B linked dicarborane C4B6H8 is formed during the spontaneous polymerization of C2B3H5 at 25C or in a hot-cold reactor. Any of the three carboranes C2B3H5, C2B4H6, or C2B5H7 polymerizes under high-energy conditions, such as a microwave discharge. Author
- Inorganic Chemistry