Coordinating Anions: (Phosphino)tetraphenylborate Ligands as New Reagents for Synthesis

Anionic, electron-releasing phosphines that incorporate a borate
counteranion within the ligand framework are promising reagents
for organometallic catalysis. This report describes the synthesis
of a new class of monodentate tertiary phosphines built upon the
commonly employed tetraphenylborate anion. These new phosphines are highly stable and strongly electron-releasing and readily
coordinate transition metals. Moreover, they are promising reagents
for catalysis, as demonstrated by their ability to promote the Suzuki
cross-coupling of aryl chloride substrates.