Scalable synthesis of catalysts for the Mizoroki–Heck cross coupling reaction: palladium nanoparticles assembled in a polymeric nanosphere
作者:Jianli Zou、K. Swaminathan Iyer、Scott G. Stewart、Colin L. Raston
DOI:10.1039/c0nj00898b
日期:——
Palladium nano-spheres 160 nm in diameter, as an assembly of uniform 5 nm nanoparticles, are accessible using a facile one step method under continuous flow on a spinning disc with hydrogen gas as the reducing agent. The stable colloidal system is an effective catalyst for the Mizoroki–Heck reaction, as established for the reaction between several aryl halides and n-butyl acrylate, and can be readily
Stabilization of Palladium Catalysts for the Heck Reaction by Support Functionalization and Solvent Selection
作者:Rafael L. Oliveira、Jasper B. F. Hooijmans、Petra E. de Jongh、Robertus J. M. Klein Gebbink、Krijn P. de Jong
DOI:10.1002/cctc.201402523
日期:2014.11
nonfunctionalized and functionalized SBA‐15 grafted with thiol or amine groups. The resulting materials were used as catalysts to study the influence of these functional groups for a similar Pd particle size of approximately 2 nm on the Heckreaction that uses iodide substrates. The nonfunctionalized catalysts lost their activity quickly because of Pd leaching and particle growth. However, if a mixed solvent that consisted
Aminoclay decorated with nano-Pd(0) picolinic acid complex as a novel efficient, heterogeneous, and phosphine ligand-free catalyst in Heck reaction under solvent-free conditions
作者:Nafiseh Fahimi、Ali Reza Sardarian
DOI:10.1007/s11164-017-2921-8
日期:2017.8
subsequently employed as an efficient and reusable heterogeneous catalyst for selective Heck coupling of aryl halide and n -butyl acrylate under solvent-free conditions. The catalyst was recoverable simply by centrifuging and was reusable for at least seven runs with a minimum amount of palladium leaching. Also, the mercury poisoning test confirmed the heterogenous nature of the catalyst.
A boehmite@tryptophan‐Pd nanoparticulate catalyst was prepared by a simple, fast and convenient route. The nanomaterial was characterized using various techniques and employed as a thermally stable catalyst for Heck, Stille and Suzuki cross‐coupling reactions. Optimized conditions for these reactions are described. The catalyst could be isolated, post‐reaction, by simple filtration and recycled for
for C–C cross coupling reactions. The SBA-Pd° nanocatalyst could be dispersed in poly(ethylene glycol) and showed excellent catalytic activity for Suzuki–Miyaura, Stille and Heck coupling reactions. In addition, the nanocatalyst could be recovered and reused several times without significant loss of its catalytic activity. Pd leaching from SBA-Pd° is very negligible for this coupling reaction.Graphical