Highly Efficient C-O Cross-Coupling Reactions with Unactivated Halides by Ligandless, Heterogeneous Raney Ni-Al Alloy/Copper (I) Salts - Xu, Li-Wen; Xia, Chun-Gu; Li, Jing-Wei; Hu, Xiao-Xue (Synlett, 2003)