Dehydrogenative coupling of aromatic thiols with Et 3 SiH catalysed by N-heterocyclic carbene nickel complexes
2013; Royal Society of Chemistry; Volume: 43; Issue: 2 Linguagem: Inglês
10.1039/c3dt52052h
ISSN1477-9234
AutoresLorena Postigo, Rita Lopes, Beatriz Royo,
Tópico(s)Catalytic C–H Functionalization Methods
ResumoA 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.
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