Copper(I) complexes with NHC ligands (NHC = N-heterocyclic carbene) are known to be highly active catalysts in various transformation. [1] We have prepared a series of neutral and cationic copper(I) complexes of the general formula [Cu(aNHC)xI] (x = 1 or 2) or [(aNHC)2Cu]+ (aNHC = triazolylidene type abnormal carbenes). Formation of the desired complex can be controlled by varying the counter-ion of the triazolium salt used. All complexes were studied by methods like NMR spectroscopy, mass spectrometry and X-Ray diffraction. Structural analysis revealed interesting coordination motifs for the different compounds. The complexes have been investigated for their catalytic properties in the azide-alkyne cycloaddition reaction. Thereby the cationic systems were found to be more active than their neutral counterparts. It was possible to convert challenging substrates at short reaction times using these systems at low catalyst loadings. [2] [3]  Figure 1  ball and stick models of selective Cu(I) complexes. [1] a) D�ez-Gonz�lez, S.; Nolan, S.P.; Angew. Chem. Int. Ed., 2008 , 47, 8881 � 8884. b) D�ez-Gonz�lez, S.; Stevens, E.D.; Scott, N.M.; Petersen, L.J.; Nolan, S.P.; Chem. Eur. J., 2008 , 14, 158 � 168. c) Zhang, L.; Cheng, J.; Hou, Z.; Chem. Commun., 2013 , 49, 4782.[2] Hohloch, S; Su, C.; Sarkar, B.; Eur. J. Inorg. Chem., 2011 ,20, 3067.[3] Hohloch, S.; Scheiffele, D.; Sarkar, B.; Eur. J. Inorg. Chem., 2013 , 22 � 23, 3956.

Copper (I) complexes of �click�-derived abnormal carbenes and their applications in catalysis

247th National Meeting (2014)

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