Palladium(<scp>ii</scp>) complexes with planar chiral ferrocenyl phosphane–(benz)imidazol-2-ylidene ligands
作者:Pauline Loxq、Nathalie Debono、Süleyman Gülcemal、Jean-Claude Daran、Eric Manoury、Rinaldo Poli、Bekir Çetinkaya、Agnès Labande
DOI:10.1039/c3nj00863k
日期:——
We describe here the first examples of planar chiral ferrocenyl phosphaneâbenzimidazol-2-ylidene ligands and their coordination chemistry with palladium(II). All ligand precursors, namely enantiopure ferrocenyl phosphaneâ(benz)imidazolium salts, and all enantiopure palladium complexes have been fully characterised by 1H, 31P and 13C NMR, mass spectrometry and X-ray diffraction methods for seven examples. The potential of these very bulky bidentate ligands in catalysis was evaluated and compared to their imidazol-2-ylidene analogues. The influence of sterics was shown to be non-negligible as the bulkiest ligand gave the lowest activities in the asymmetric SuzukiâMiyaura reaction.
我们在此介绍了平面手性二茂铁磷烷苯并咪唑-2-亚基配体及其与钯(II)的配位化学反应。通过 1H、31P 和 13C NMR、质谱和 X 射线衍射方法,对所有配体前体(即对映纯二茂铁磷烷苯并咪唑盐)和所有对映纯钯配合物进行了全面表征,共七个实例。对这些非常笨重的双齿配体的催化潜力进行了评估,并与它们的咪唑-2-亚基类似物进行了比较。结果表明,在不对称铃木-米亚乌拉反应中,最粗大配体的活性最低,因此立体结构的影响不可忽视。