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	Ionic liquids as acid/base buffers in non-aqueous solvents for homogeneous catalysis: A case of selective hydrogenation of olefins and unsaturated aldehyde catalyzed by ruthenium complexes
	Xu, Li ; Ou, Guangnan ; Yuan, Youzhu ; Yuan YZ(袁友珠)
	2008-06
关键词	ionic liquid buffer ruthenium complex hydrogenation non-aqueous system
英文摘要	We present a novel approach to tune acidity/basicity in non-aqueous and low-water media by using a class of ionic liquids (ILs) with buffering characteristics, which was readily synthesized by the reaction of 1-alkyl-3-methylimidazolium hydroxide ([RMIM] OH) base moieties with a serials of binary or polybasic acids and defined as ionic liquid-buffers (IL-buffers). We have performed controlled experiments of hydrogenation of olefins and trans-cinnamaldehyde, catalyzed by [RuCl2(PPh3)(3)] in non-aqueous media such as DMF and ILs in the presence of IL-buffers. Remarkable buffer dependence of the formation and catalytic behavior of ruthenium hydrides were evidenced by the kinetic studies and NMR measurements. The hydride [RuHCl(PPh3)(3)], being favorably formed in the presence of the IL-buffer with lower log(10)([Base]/[Acid]), exhibited higher activity in the reduction of the C=C bond against the carbonyl functionality of trans-cinnamaldehyde. While the hydride [RuH4(PPh3)(3)], being preponderantly formed in the presence of the IL-buffer with higher log10([Base]/[Acid]) showed activity and higher selectivity towards the C=C reduction. Consequently, the hydrogenation performance of olefins and trans-cinnamaldehyde in non-aqueous system could be adjusted by adding the different IL-buffers. It is envisioned that the ability of IL-buffers to alter and precisely control the catalytic active species in non-aqueous or low-water systems might find appreciable applications for both fundamental studies and syntheses where the reactions are acid/base-sensitive. (C) 2008 Elsevier B. V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE SA
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.jorganchem.2008.06.028]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Xu, Li,Ou, Guangnan,Yuan, Youzhu,et al. Ionic liquids as acid/base buffers in non-aqueous solvents for homogeneous catalysis: A case of selective hydrogenation of olefins and unsaturated aldehyde catalyzed by ruthenium complexes[J],2008.
APA	Xu, Li,Ou, Guangnan,Yuan, Youzhu,&袁友珠.(2008).Ionic liquids as acid/base buffers in non-aqueous solvents for homogeneous catalysis: A case of selective hydrogenation of olefins and unsaturated aldehyde catalyzed by ruthenium complexes..
MLA	Xu, Li,et al."Ionic liquids as acid/base buffers in non-aqueous solvents for homogeneous catalysis: A case of selective hydrogenation of olefins and unsaturated aldehyde catalyzed by ruthenium complexes".(2008).

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