A series of novel palladium(ii) acetylacetonato complexes bearing mesoionic
carbenes (MICs) have been synthesized and characterized. The synthesis of the
complexes of type (MIC)Pd(acac)I (MIC =
1-mesityl-3-methyl-4-phenyl-1,2,3-triazol-5-ylidene (1),
1,4-(2,4,6-methyl)-phenyl-3-methyl-1,2,3-triazol-5-ylidene (2),
1,4-(2,6-diisopropyl)-phenyl-3-methyl-1,2,3-triazol-5-ylidene (3); acac =
acetylacetonato) via direct metalation starting from the corresponding
triazolium iodides and palladium(ii) acetylacetonate is described herein. All
complexes were characterized by 1H- and 13C-NMR spectroscopy and high
resolution mass spectrometry. Additionally, two of the complexes were
characterized by single crystal X-ray crystallography confirming a square-
planar coordination geometry of the palladium(ii) center. A delocalized
bonding situation was observed within the triazolylidene rings as well as for
the acac ligand respectively. Complex 2 was found to be an efficient pre-
catalyst for the Suzuki-Miyaura cross coupling reaction between aryl-bromides
or -chlorides with phenylboronic acid. View Full-Tex