N-Heterocyclic Carbene-Ytterbium Amide as a Recyclable Homogeneous Precatalyst for Hydrophosphination of Alkenes and Alkynes
作者:Jia Yuan、Hongfan Hu、Chunming Cui
DOI:10.1002/chem.201600512
日期:2016.4.11
carbene–ytterbium(II) amides (NHC)2Yb[N(SiMe3)2]2 (1: NHC: 1,3,4,5‐tetramethylimidazo‐2‐ylidene (IMe4); 2: NHC: 1,3‐diisopropyl‐4,5‐dimethylimidazol‐2‐ylidene (IiPr)) and the NHC‐stabilized rare‐earth phosphide (IMe4)3Yb(PPh2)2 (3) have been synthesized and fully characterized. Complexes 1–3 are active precatalysts for the hydrophosphination of alkenes, alkynes, and dienes and exhibited much superior catalytic
N-杂环卡宾-y(II)酰胺(NHC)2 Yb [N(SiMe 3)2 ] 2(1:NHC:1,3,4,5-四甲基咪唑-2-基(IMe 4); 2: NHC:1,3-二异丙基-4,5-二甲基咪唑-2-亚基(I我PR))和NHC稳定稀土磷化物(IME 4)3的Yb(PPH 2)2(3)已被合成并充分的特征。配合1 - 3是用于烯烃,炔烃和二烯加氢磷酸化的活性预催化剂,其催化活性优于不含NHC的酰胺(THF)2 Yb [N(SiMe)2 ] 2。配合物1是三种配合物中活性最高的前体。特别地,可以在催化反应之后将络合物1再循环并从反应介质中回收。此外,发现配合物3可以催化苯乙烯的聚合以产生低分子量的无规立构聚苯乙烯。据我们所知,配合物1代表第一个可在催化反应后回收的稀土配合物。