NHC-Pd(II) complex-Cu(I) co-catalyzed homocoupling reaction of terminal alkynes

Two NHC-Pd(II) complexes synthesized from traps-cyclohexane-1,2-diamine were fairly effective in the NHC-Pd(II) complex/Cu co-catalyzed terminal alkyne homocoupling reaction to give the corresponding symmetrical 1,4-disubstituted 1,3-diynes in good yields under mild conditions. Copyright (c) 2006 John Wiley & Sons, Ltd.