2-PHASE HYDROFORMYLATION OF OCTENE-1 WITH RHODIUM COMPLEXES OF P[C6H4(CH2)MC6H4-P-SO3NA]3 (M=3, 6) - RATE AND SELECTIVITY ENHANCEMENT WITH SURFACE-ACTIVE PHOSPHINES

被引:99
作者
DING, H [1 ]
HANSON, BE [1 ]
BARTIK, T [1 ]
BARTIK, B [1 ]
机构
[1] VIRGINIA POLYTECH INST & STATE UNIV,DEPT CHEM,BLACKSBURG,VA 24061
关键词
D O I
10.1021/om00022a005
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The new sulfonated phosphines P[C6H4-(CH2)mC6H4-p-SO3Na]3 (m = 3, 6) are synthesized by direct sulfonation of P[C6H4(CH2)mC6H5]3 with concentrated sulfuric acid. Dynamic light scattering experiments show that the sulfonated phosphines aggregate in 0.25 M NaCl solution. These aggregates have a hydrodynamic radius of 20 and 32 angstrom, respectively, for the phosphines with m = 3 and m = 6. In the two-phase hydroformylation of octene-1 the rhodium catalysts derived from the new phosphines show significant improvement over catalysts generated from trisulfonated triphenylphosphine. Not only are the initial rates faster but also the reaction selectivity as reflected by the n/b ratio is better; specifically, at a ligand/rhodium ratio of 10 the n/b values are 8.0 and 9.5, respectively, for m = 3 and m = 6 compared to 3.6 for trisulfonated triphenylphosphine.
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页码:3761 / 3763
页数:3
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