Effect of trimethylsilyl substitution on the chemical properties of triarylphosphines and their corresponding metal-complexes: solubilising effect in supercritical carbon dioxide
for the known triphenylphosphine complexes. Again, the contrast of the (31)P NMR and (13)C NMR chemical shifts or C-O or M-Cl stretchingfrequencies, when applied, does not show an important electronic effect on the metal complex of the trimethylsilyl substituted phosphines with respect to P(C(6)H(5))(3) derivatives. Solubility measurements of complexes 3a and 3b in scCO(2) were performed. We conclude
Fluorous Versions of Wilkinson's Catalyst. Activity in Fluorous Hydrogenation of 1-Alkenes and Recycling by Fluorous Biphasic Separation
作者:Bodo Richter、Anthony L. Spek、Gerard van Koten、Berth-Jan Deelman
DOI:10.1021/ja993562v
日期:2000.4.1
Wilkinson's catalyst show high activity in hydrogenation of 1-alkenes under single phase fluorous conditions and can be effectively recycled using the new concept of fluorous biphasic separation. For comparison the p-(trimethylsilyl)-substituted derivative RhCl(P(C6H4-p-SiMe3)3)3 (3c) has also been synthesized and the X-ray structure of dimeric (Rh(I-Cl)P(C6H4- p-SiMe3)3}2)2 (4c) was determined. A comparison
Synthesis and Properties of a Novel Family of Fluorous Triphenylphosphine Derivatives
作者:Bodo Richter、Elwin de Wolf、Gerard van Koten、Berth-Jan Deelman
DOI:10.1021/jo991548v
日期:2000.6.1
A novel approach to the preparation of perfluorotail-functionalized triarylphosphines using a p-silyl substituent as the branching point has been developed. This approach enabled the attachment of between three and nine perfluarotails per phosphorus atom, resulting in the production of highly fluorous tris [p-(1H,1H,2H,2H-perfluoroalkylsilyl)aryl] phosphines, P[C6H4-p-SiMe3-n(CH2CH2CxF2x+1)(n)](3) (n = 1, 2, 3; x = 6, 8), containing between 50 and 67 wt % nuorine. P-31 NMR studies indicate that the phosphorus atoms, and consequently the a-donor and pi-acceptor properties of these phosphines, are not influenced by the electron-withdrawing perfluoroalkyltails. The fluorous triarylphosphines are readily soluble in fluorous solvents and display fluorous phase preference in several fluorous biphasic systems. The phase partitioning of these fluorous ligands, as well as their donor properties, is discussed in relation to their potential for fluorous biphasic catalyst separation.
Grim; Yankowsky, Phosphorus and Sulfur and the Related Elements, 1977, vol. 3, p. 191,192,194
作者:Grim、Yankowsky
DOI:——
日期:——
Synthesis and phosphorous-31 NMR studies of tertiary arylphosphine complexes of mercury(II) halides
作者:Samuel O. Grim、Dilip P. Shah、Carol K. Haas、Joel M. Ressner、Patricia H. Smith