Dehydrogenative silylation of alcohols catalysed by half-sandwich iron N-heterocyclic carbene complexes
2014; Elsevier BV; Volume: 775; Linguagem: Inglês
10.1016/j.jorganchem.2014.06.005
ISSN1872-8561
AutoresJoão M. S. Cardoso, Rita Lopes, Beatriz Royo,
Tópico(s)Catalytic Cross-Coupling Reactions
ResumoA new series of tetramethylcyclopentadienyl-functionalised N-heterocyclic carbene complexes of iron bearing different wingtips of general type (Cp*-NHCR)Fe(CO)I (R = nBu, iBu, Et, CH2CH2OMe, CH2Ph) were prepared by direct reaction of Fe3(CO)12 and the corresponding imidazolium proligands. These new iron-NHC complexes have been found to be efficient catalysts for the dehydrogenative silylation of alcohols with silanes. Iron metal complexes bearing iso-butyl and n-butyl wingtips displayed slightly better catalytic performances than the related complexes (Cp*-NHCR)Fe(CO)I (R = Et, CH2CH2OMe, CH2Ph), affording quantitative yields of the corresponding silylethers in 8 h at 70 °C in acetonitrile.
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