Dehydrogenative silylation of alcohols catalysed by half-sandwich iron N-heterocyclic carbene complexes
作者:João M.S. Cardoso、Rita Lopes、Beatriz Royo
DOI:10.1016/j.jorganchem.2014.06.005
日期:2015.1
A new series of tetramethylcyclopentadienyl-functionalised N-heterocyclic carbene complexes of iron bearing different wingtips of general type (Cp*-NHCR)Fe(CO)I (R = Bu-n, Bu-i, Et, CH2CH2OMe, CH2Ph) were prepared by direct reaction of Fe-3(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 degrees C in acetonitrile. (C) 2014 Elsevier B.V. All rights reserved.
CpFe(CO)<sub>2</sub> anion-catalyzed highly efficient hydrosilylation of ketones and aldehydes
作者:Ke Lou、Qingyang Zhou、Qi Wang、Xingchao Fan、Xiufang Xu、Chunming Cui
DOI:10.1039/d1dt01778k
日期:——
K[CpFe(CO)2] and [NEt4][CpFe(CO)2] enabled highly efficient hydrosilylation of ketones and aldehydes with PhSiH3 to synthesize tris- and bis(alkoxy)silanes in excellent yields depending on the substituents on the carbonyl compounds. The catalyst represents one of the most efficient and practical iron catalysts for hydrosilylation of carbonyl compounds with a TOF up to 24 540 h−1.