A Versatile Ruthenium Precursor for Biphasic Catalysis and Its Application in Ionic Liquid Biphasic Transfer Hydrogenation: Conventional vs Task-Specific Catalysts
摘要:
The synthesis of a novel imidazolium-tagged ruthenium complex, which represents a versatile precursor for aqueous and ionic liquid biphasic catalysis, is reported. Its utility is demonstrated in the highly enantioselective ionic liquid biphasic transfer hydrogenation of acetophenone and is compared to conventional (untagged) complexes.
A Versatile Ruthenium Precursor for Biphasic Catalysis and Its Application in Ionic Liquid Biphasic Transfer Hydrogenation: Conventional vs Task-Specific Catalysts
摘要:
The synthesis of a novel imidazolium-tagged ruthenium complex, which represents a versatile precursor for aqueous and ionic liquid biphasic catalysis, is reported. Its utility is demonstrated in the highly enantioselective ionic liquid biphasic transfer hydrogenation of acetophenone and is compared to conventional (untagged) complexes.
Synthesis of Imidazolium-Tethered Ruthenium(II)-Arene Complexes and Their Application in Biphasic Catalysis
作者:Tilmann J. Geldbach、Gábor Laurenczy、Rosario Scopelliti、Paul J. Dyson
DOI:10.1021/om050849u
日期:2006.1.1
Reaction of RUCl3 with 1-[2-(1,4-cyclohexadiene-1-yl)alkyl]-3-methylimidazolium chloride (alkyl = ethyl, butyl) and 1-[2-(1,4-cyclohexadiene-1-yl)ethyl]-2,3-dimethylimidazolium chloride affords a series of dimeric ruthenium complexes of the type [RuCl2(eta(6)-arene)](2)Cl-2. Treatment of these dimeric salts with phosphine ligands leads to the highly water-soluble monomeric complexes [RuCl2PR3(eta(6)-arene)]Cl (PR3 = PPh3, PCY3). Reaction of [RUCl2(eta-1-(2-benzylethyl)-3-butylimidazolium)]Cl with Ag2O gives rise to a eta(6)-arene-carbene chelate complex. The phosphine complexes have been tested as catalysts in the hydrogenation of styrene immobilized in water or an ionic liquid and in the aqueous reduction Of CO2/ CO32-. A carbonate-hydride complex has been identified as intermediate by high-pressure NMR measurements. The solid-state structures of several of the new imidazolium-functionalized arene complexes including the arene-carbene chelate complex are reported.
A Versatile Ruthenium Precursor for Biphasic Catalysis and Its Application in Ionic Liquid Biphasic Transfer Hydrogenation: Conventional vs Task-Specific Catalysts
作者:Tilmann J. Geldbach、Paul J. Dyson
DOI:10.1021/ja048886k
日期:2004.7.1
The synthesis of a novel imidazolium-tagged ruthenium complex, which represents a versatile precursor for aqueous and ionic liquid biphasic catalysis, is reported. Its utility is demonstrated in the highly enantioselective ionic liquid biphasic transfer hydrogenation of acetophenone and is compared to conventional (untagged) complexes.