Abstract
AbstractAlternative procedures are reported for the preparation of PEPPSI‐type palladium complexes (PEPPSI = pyridine‐enhanced precatalyst preparation stabilization and initiation) in good to excellent yields. One method involves the reaction of [(NHC)Pd(acac)Cl] complexes (NHC = N‐heterocyclic carbene, acac = acetylacetonate) with hydrohalides (HX; X = Cl, Br, I) of pyridine or 2,6‐lutidine. Two other one‐pot syntheses involve Pd(acac)2, the azolium salt and pyridine hydrohalide (or 2,6‐lutidine hydrohalide). The complexes were obtained as moisture‐ and air‐stable solids and were characterized by 1H and 13C NMR spectroscopy, CHN analysis, and IR spectroscopy. The various synthetic procedures and the yields of the desired products are discussed. The X‐ray structure of [1‐(2,6‐diisopropylphenyl)‐3‐(2,4,6‐trimethylphenyl)imidazolin‐2‐ylidene]Pd(acac)Cl (4c) is also reported.
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