A variety of diaryl ethers were synthesized by the Pd-catalyzed reaction of (hetero)aryl halides and phenols. These reactions were achieved through the use of two new di-tert-butylphosphino biaryl ligands that overcome several limitations of previously described methods.
“Significantly Improved Method for the Pd-Catalyzed Coupling of Phenols with Aryl Halides: Understanding Ligand Effects”, Angew. Chem. Int. Ed., 2006, 45(26), 4321-4326.