Catalytic properties of water-soluble rhodium and iridium complexes:: the influence of the ligand structure

被引:22
作者
Gulyás, H
Bényei, AC
Bakos, J
机构
[1] Univ Veszprem, Dept Organ Chem, H-8201 Veszprem, Hungary
[2] Hungarian Acad Sci, Res Grp Petrochem, H-8201 Veszprem, Hungary
[3] Univ Debrecen, Dept Chem, H-4010 Debrecen, Hungary
基金
匈牙利科学研究基金会;
关键词
rhodium; iridium; water-soluble; sulfonated phosphane; homogeneous hydrogenation; aldehyde; X-ray analysis; guanidium; cone angle;
D O I
10.1016/j.ica.2004.01.002
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Rhodium and iridium complexes of trisulfonated triarylphosphanes, TPPTS (tris(3-sulfonatophenyl)phosphane), T(p-A)PTS (tris(3-sulfonato-4-methoxyphenyl)phosphane), T(2,4-X)TS (tris(2,4-dimethyl-5-sulfonatophenyl)phosphane), have been tested in biphasic hydrogenation of aldehydes. T(2,4-X)TS could not stabilize the rhodium complex under the applied conditions. Guanidium salt of T(2,4-X)TS has been characterized by X-ray crystallography.. and Tolman cone angle of the phosphane has been determined from crystallographic data. The large cone angle (196degrees, 210degrees) explains the instability of the rhodium complex. Contrary to the T(2,4-X)TS/rhodium system, the T(2,4-X)TS/iridium catalyst has been found to be stable and effective in hydrogenation of benzaldehyde and caproaldehyde. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:3094 / 3098
页数:5
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