Are Halocarboranes Suitable for Substitution Reactions? The Case for 3-I-1,2-<i>closo</i>-C<sub>2</sub>B<sub>10</sub>H<sub>11</sub>: Molecular Orbital Calculations, Aryldehalogenation Reactions, <sup>11</sup>B NMR Interpretation of <i>closo</i>-Carboranes, and Molecular Structures of 1-Ph-3-Br-1,2-<i>closo</i>-C<sub>2</sub>B<sub>10</sub>H<sub>10</sub> and 3-Ph-1,2-<i>closo</i>-C<sub>2</sub>B<sub>10</sub>H<sub>11</sub>
作者:Clara Viñas、Gemma Barberà、Josep M. Oliva、Francesc Teixidor、Alan J. Welch、Georgina M. Rosair
DOI:10.1021/ic010493o
日期:2001.12.1
In this paper, the chemistry of 3-X-1,2-closo-C2B10H11 (X = halogen) derivatives is extended. Molecular orbital and B-11 and C-13 NMR calculations on these species are presented. A qualitative interpretation of the B-11 NMR spectra of closo o-carborane derivatives is also provided. The synthesis of 3-X-1-R-o-carborane (X = I, Br and R = Me, Ph) derivatives is reported, and aryldehalogenation at the B3 position is reported for the first time. The molecular and crystal structures of 1-phenyl-3-bromo-1,2-dicarba-closo-dodecaborane and 3-phenyl-1,2-dicarba-closo-dodecaborane are described.