Transfer hydrogenation reduction of ketones, aldehydes and imines using chelated iridium(III) N -heterocyclic bis-carbene complexes
作者: John R. MiecznikowskiRobert H. Crabtree
作者单位: 1Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT 06520-8107, USA
刊名: Polyhedron, 2004, Vol.23 (17), pp.2857-2872
来源数据库: Elsevier Journal
DOI: 10.1016/j.poly.2004.07.001
关键词: N -Heterocyclic carbenesHomogenous catalysisTransfer hydrogenationKetonesAldehydesImines
英文摘要: Abstract(#br)A series of imidazolium and triazolium chelate ligand precursors are metalated with [Ir(coe) 2 Cl] 2 (coe=cyclooctene) or [Ir(cod)Cl] 2 (cod=1,5-cyclooctadiene) to give iridium(III) N -heterocyclic carbene (NHC) chelates [(NHC)(linker)(NHC)IrI 2 (OAc)]. The triazolium salts metalate more easily and give less electron donating NHCs as shown by IR spectroscopy on analogous iridium(I) carbonyl derivatives. The iridium(III) complexes show activity for the title catalytic reactions in 2-propanol that is very variable, depending on the nature of the linker and terminal N -substituents. Selective reduction of aldehydes over ketones becomes possible with K 2 CO 3 , an alternative base promoter to the usual...
全文获取路径: Elsevier  (合作)
影响因子:1.813 (2012)