Sterically Demanding, Zwitterionic Trialkylphosphonium Sulfonates as Air-Stable Ligand Precursors for Efficient Palladium-Catalyzed Cross-Couplings of Aryl Bromides and Chlorides - Brown, William S; Boykin, D’Ariel D; Sonnier Jr, M Quentin; Clark, William D; Brown, Fallon V; Shaughnessy, Kevin H (Synthesis, 2008)