Copper(II) Acetate/1,4-Diphenyl-1,4-diazabuta-1,3-diene Catalyzed Sonogashira Cross-Coupling of Aryl Halides with Terminal Alkynes under Aerobic and Solvent-Free Conditions - Deng, Chen-Liang; Xie, Ye-Xiang; Yin, Du-Lin; Li, Jin-Heng (Synthesis, 2006)