We prepared new thioether-arylphosphines bearing alkyl and fluoroalkyl chains at the sulfur atom in order to use them in metal-catalyzed reactions in new reaction media, such as a fluorous biphasic system. The characterization of the new compounds is discussed and the partition coefficients in the biphasic system perfluoromethylcyclohexane-cyclohexane were determined. Fluorous thioether-phosphines reacted with [Rh(acac)(CO)2] under fluorous biphasic conditions to produce rhodium species retained in the fluorous phase with ≤2.32 ppm of rhodium loss in the organic phase. The effect of S-ponytails on the coordination properties of the new phosphines and their relation with ³¹P NMR chemical shifts were supported by DFT calculations.
Unexpected bond activations promoted by palladium nanoparticles
作者:A. M. López-Vinasco、I. Favier、C. Pradel、L. Huerta、I. Guerrero-Ríos、E. Teuma、M. Gómez、E. Martin
DOI:10.1039/c3dt53649a
日期:——
for the stabilisation of palladium nanoparticles (PdNPs) synthesised by a bottom-up methodology, using [Pd2(dba)3] as an organometallic precursor. For the phenyl containing ligand 1, small (dmean = 1.6 nm), well-defined and dispersed nanoparticles were obtained; however, ligand 2 involving a long alkyl chain led to agglomerates. NMR and GC-MS analyses throughout the synthesis of the nanomaterials revealed