Increasing the Lipophilic Character of Tetraphenylborate Anions through Silyl Substituents

Trimethylsilyl- and dimethyl(1<i>H</i>,1<i>H</i>,2<i>H</i>,2<i>H</i>-perfluorooctyl)silyl substituents have been introduced in the para position of tetraphenylborate anions, resulting in enhanced solubility of their complexes <i>n</i>-Bu<sub>4</sub>N[B(C<sub>6</sub>H<sub>4</sub>SiMe<sub>2</sub>R-4)<sub>4</sub>] (R = Me, CH<sub>2</sub>CH<sub>2</sub>C<sub>6</sub>F<sub>13</sub>) and [Rh(dppe)<sub>2</sub>][B(C<sub>6</sub>H<sub>4</sub>SiMe<sub>2</sub>R-4)<sub>4</sub>] (dppe = 1,2-bis(diphenylphosphino)ethane, R = Me, CH<sub>2</sub>CH<sub>2</sub>C<sub>6</sub>F<sub>13</sub>) in apolar organic solvents.