Rhodium Complexes Bearing PAlP Pincer Ligands

We report rhodium complexes bearing PAlP pincer ligands with an X-type aluminyl moiety. IR spectroscopy and single-crystal X-ray diffraction analysis of a carbonyl complex exhibit the considerable σ-donating ability of the aluminyl ligand, whose Lewis acidity is confirmed through coordination of pyridine to the aluminum center. The X-type PAlP–Rh complexes catalyze C2-selective monoalkylation of pyridine with alkenes.

本工作报道了一类带有含X型铝基（aluminyl）片段的PAlP钳形配体的铑配合物。通过对其羰基配合物的红外光谱（IR spectroscopy）与单晶X射线衍射分析，证实了该铝基配体具有较强的σ给电子能力；而吡啶与铝中心的配位作用则验证了其路易斯酸性。此类X型PAlP–铑配合物可催化烯烃与吡啶发生C2位选择性单烷基化反应。