Postigo Lorena, Lopes Rita, Royo Beatriz
Instituto de Tecnología Química e Biológica da Universidade Nova de Lisboa, Av. da República, EAN, 2780-417 Oeiras, Portugal.
Dalton Trans. 2014 Jan 14;43(2):853-8. doi: 10.1039/c3dt52052h.
A series of new tetramethylcyclopentadienyl-functionalised N-heterocyclic carbene ligands with different wingtip substituents have been prepared and characterised. These ligands have been successfully coordinated to nickel affording complexes of the general type (Cp*-NHC(R))NiX (X = Cl, I). These well-defined nickel complexes selectively catalysed the coupling of aromatic thiols with Et3SiH to give the corresponding silylthioethers (RSSiEt3). The nickel complexes bearing ethyl, iso-butyl, and n-butyl wingtips displayed comparable catalytic efficiency, while the nickel complex bearing a methyl substituent on the wingtip was the worst performing catalyst.
一系列具有不同翼尖取代基的新型四甲基环戊二烯基官能化 N-杂环卡宾配体已被制备并表征。这些配体已成功与镍配位，得到通式为 (Cp*-NHC(R))NiX（X = Cl、I）的配合物。这些定义明确的镍配合物选择性地催化芳族硫醇与 Et3SiH 的偶联反应，生成相应的甲硅烷基硫醚（RSSiEt3）。带有乙基、异丁基和正丁基翼尖的镍配合物表现出相当的催化效率，而在翼尖带有甲基取代基的镍配合物是性能最差的催化剂。
