Three newpalladium catalysts, prepared via reactions of PdCl2 with readily obtained and inexpensive dicationic imidazolium salts, have been developed for the Suzuki reaction. The pre-catalyst was formed in situ using the imidazolium ligand, base and Pd metal precursor in 1,4-dioxane. This palladium catalyst provides a convenient and general method for the synthesis of biaryls from aryl bromides, activated
The immobilisation of an oxime-based palladacycle on polyvinylpyridine (PVP) resin affords a reusable, air, moisture and thermally stable palladium precatalyst which exerts high activity in Suzuki-Miyaura reactions both in batch as well as continuous-flow processes. Evidence is presented which shows that, besides serving as an anchor for the precatalyst, PVP also acts as a scavenger for Pd particles present in solution.
Suzuki coupling catalyzed by a homoleptic Pd(I)–Pd(I) solvento complex
作者:Xiaoyan Han、Zhiqiang Weng、T. S. Andy Hor
DOI:10.1016/j.jorganchem.2007.09.029
日期:2007.12
catalytically active towards Suzuki cross-coupling reactions of aryl bromides or chlorides with various arylboronic acids under mild conditions giving good to excellent yields. Its performance is enhanced by the introduction of stoichiometric or limited phosphines. The effects of different ligands, metal oxidation states [Pd(II), Pd(I) Pd(0)], bases and solvents have been examined.
Diamines as interparticle linkers for silica–titania supported PdCu bimetallic nanoparticles in Chan–Lam and Suzuki cross-coupling reactions
作者:Babita Jamwal、Manpreet Kaur、Harsha Sharma、Chhavi Khajuria、Satya Paul、J. H. Clark
DOI:10.1039/c8nj05050c
日期:——
The remarkable synergetic effect between Pd and Cu, and basic nitrogen sites on the support effectively stabilize the nanoparticles and enhance the catalytic activity.
Pd和Cu之间的卓越协同效应,以及支撑物上的碱性氮位点有效地稳定了纳米颗粒,并增强了催化活性。
Carbon-Carbon Cross-Coupling Reactions under Continuous Flow Conditions Using Poly(vinylpyridine) Doped with Palladium
as Raschig rings or placed within the PASSflow TM microreactor affords technical devices that are well suited for performing palladium-catalyzed carbon-carbon cross-couplingreactions in the flow-through mode. Reusability of the immobilized precatalyst as well as applications in the microwave field were investigated. Experiments with thiol- and pyridine-based scavengers were carried out, which revealed