Two NHC–Pd(II) complexes synthesized from trans ‐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.
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Shi et al. (2006) studied this question.
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