A number of palladium(II) complexes with a heteroditopic NHC-amine ligand and their precursor silver(I) carbene complexes have been efficiently prepared and their structural features have been investigated. The heteroditopic coordination of this ligand class was unequivocally shown by NMR-spectroscopy and X-ray crystallographic analysis. The neutral and cationic cis-methyl-palladium(NHC) complexes are not prone to reductive elimination, which is normally a major degenerative pathway for this type of complex. In contrast, under carbon monoxide atmosphere rapid reductive elimination of the acyl-imidazolium salt was observed.
我们有效地制备了一些具有异配位 NHC-amine
配体的
钯(II)配合物及其前体碳化
银(I)配合物,并研究了它们的结构特征。核磁共振光谱和 X 射线晶体分析明确显示了该
配体类别的异位配位。中性和阳离子顺式甲基
钯(NHC)配合物不易发生还原消除,而还原消除通常是这类配合物的主要退化途径。相反,在
一氧化碳环境下,酰基
咪唑鎓盐迅速发生还原消除。