An ionic phosphine-ligated rhodium(III) complex as the efficient and recyclable catalyst for biphasic hydroformylation of 1-octene

作者：Chen, Sheng Jie; Wang, Yong Yong; Yao, Wei Min; Zhao, Xiao Li; Giang VO Thanh; Liu, Ye^*

来源：Journal of Molecular Catalysis A: Chemical , 2013, 378: 293-298.

DOI：10.1016/j.molcata.2013.07.004

• Biphasic hydroformylation
• Ionic complex
• Rhodium complex
• Phosphine
• Functionalized ionic liquid

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.

• 出版日期2013-11-1
• 单位华东师范大学