期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 378, 期 -, 页码 293-298出版社
ELSEVIER
DOI: 10.1016/j.molcata.2013.07.004
关键词
Biphasic hydroformylation; Ionic complex; Rhodium complex; Phosphine; Functionalized ionic liquid
资金
- National Natural Science Foundation of China [21273077, 21076083]
- Program Cai Yuanpei
- 973 Program from Ministry of Science and Technology of China [2011CB201403]
- Fundamental Research Funds for the Central Universities
A novel ionic complex with insensitivity to moisture and air, bis-[1-butyl-2-diphenylphosphanyl-3-methylimidazolium]tetrachloridorhodium(III) hexafluorophosphate (1A), has been synthesized and fully characterized. The single-crystal X-ray diffraction analysis shows that 1A is composed of the Rh(III)-complex cation and the counter-anion of PF6-. The complex cation has highly symmetrical Rh-III-centered octahedron geometry with four Cl atoms in the equatorial plane and two imidazolium-substituted phosphine ligands in the axial position. The catalytic performance of 1A, which could be tailored by the ligands and the solvents, was investigated toward the biphasic hydroformylation of 1-octene. It was found that the presence of the hemilabile hybrid P,N-ligand of 3 (1-(2'-piperid-1'-yl-ethyl)-2-diphenylphosphino-3-methylimidazolium hexafluorophosphate), as a kind of ligand-functionalized ionic liquids (ILs), could dramatically spur the catalytic activity of 1A. The use of the RTIL of [PEmim]BF4 (1-(2'-piperid-1'-yl-ethyl)-3-methylimidazolium tetrafluoroborate) as the solvent not only fulfilled the efficient biphasic hydroformylation of 1-octene, but also guaranteed the successful recovery and recycling of the ionic compositions of 1A and 3. (c) 2013 Elsevier B.V. All rights reserved.
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