Catalyst Deactivation by β‐Hydride Elimination: Olefin and Alkyne Insertion into Arenido–Nickel(II) Bonds
作者:Monika M. Lindner、Udo Beckmann、Eva Eichberger、Guido J. Reiß、Wolfgang Kläui
DOI:10.1002/ejic.200901179
日期:2010.6
been elucidated by investigating the reactions of such complexes with aliphatic unsaturated compounds like olefins and alkynes. We have shown that the double or triple bond, respectively, inserts into the nickel–carbon bond followed by β-hydride elimination resulting in aryl-substituted olefins and allenes, which have been identified by means of GC/MS. The remaining nickel forms a bis(N,O-chelate ligand)nickel
包含 N,O-螯合配体的方形平面芳烃-(三苯基膦)镍 (II) 配合物 (3) 是一氧化碳/乙烯共聚反应的催化剂。通过研究此类配合物与脂肪族不饱和化合物(如烯烃和炔烃)的反应,阐明了催化剂失活的途径。我们已经表明,双键或三键分别插入镍-碳键,然后β-氢化物消除,产生芳基取代的烯烃和丙二烯,这些已通过 GC/MS 进行鉴定。剩余的镍形成双(N,O-螯合配体)镍络合物,其晶体结构已确定。镍原子由两个配体以方形平面方式配位。