A General and Mild Ullmann-Type Synthesis of Diaryl Ethers. -The title method uses inexpensive ligands. A series of diaryl ethers is obtained with excellent yields in the presence of Cs 2 CO 3 and catalytic copper(I) oxide. Substrates with unfavorable substitution patterns, such as sterically hindered coupling partners or electron-rich aryl halides are tolerated. -(CRISTAU*, H.-J.; CELLIER, P. P.; HAMADA, S.; SPINDLER, J.-F.; TAILLEFER*, M.; Org. Lett. 6 (2004) 6, 913-916; Lab. Chim. Org., CNRS, Ec. Natl. Super. Chim., F-34296 Montpellier, Fr.; Eng.) -Steudel 31-083