Reusable shuttles for exchangeable functional cargos: Reversibly assembled, magnetically powered organocatalysts for asymmetric aldol reactions
作者:Carolina Mendoza、Augustin de la Croix、Paola Riente、Lluís Llorens、Javier de Mendoza、Miquel A. Pericàs
DOI:10.1016/j.tet.2019.130592
日期:2019.10
supramolecular approach has been followed to support adamantyl substituted proline organocatalysts onto the surface of magnetite nanoparticles decorated with a β-cyclodextrin motif. The resulting magneticnanoparticles (ca. ∼10 nm diameter) were used as modular, magneticallyrecyclable catalysts in the asymmetric aldolreaction of aromatic aldehydes with cyclic ketones in water. The catalytic assemblies
γ‐Fe2O3 nanoparticles were formed inside the cage‐like pores of mesocellularfoam (MCF). These magnetic nanoparticles showed a uniform size distribution that could be easily controlled by the MCF pore size, as well as by the hydrocarbon chain length used for MCF surface modification. Throughout the entrapment process, the pore structure and surface area of the MCF remained intact. The resulting magnetic
Heterogeneous Organocatalysis at Work: Functionalization of Hollow Periodic Mesoporous Organosilica Spheres with MacMillan Catalyst
作者:Jiao Yi Shi、Chang An Wang、Zhi Jun Li、Qiong Wang、Yuan Zhang、Wei Wang
DOI:10.1002/chem.201100072
日期:2011.5.23
We report a new method for the synthesis of hollow‐structured phenylene‐bridged periodicmesoporousorganosilica (PMO) spheres with a uniform particle size of 100–200 nm using α‐Fe2O3 as a hard template. Based on this method, the hollow‐structured phenylene PMO could be easily functionalized with MacMillancatalyst (H‐PhPMO‐Mac) by a co‐condensation process and a “click chemistry” post‐modification
A click strategy for the immobilization of palladium nanoparticles onto silica: efficient and recyclable catalysts for carbon–carbon bond formation under mild reaction conditions
作者:Abdol R. Hajipour、Parisa Abolfathi、Fatemeh Mohammadsaleh
DOI:10.1039/c6ra11734a
日期:——
An interesting silica-supported nano-palladium catalyst was successfully prepared through ''click'' reaction of azide-functionalized silica with methylpropargylimidazolium bromide followed by immobilization of palladium nanoparticles (NPs), in which the click-triazole as an...
Triazole-Functionalized Silica Supported Palladium(II) Complex: A Novel and Highly Active Heterogeneous Nano-catalyst for C–C Coupling Reactions in Aqueous Media
作者:Abdol Reza Hajipour、Fatemeh Mohammadsaleh
DOI:10.1007/s10562-018-2316-5
日期:2018.4
which were well characterized and evaluated in Suzuki–Miyaura coupling in terms of activity and recyclability in H2O/EtOH solvent. The catalyst A showed more reasonable results and so, was applied as a highly efficient and recyclable catalyst in the coupling reactions of various aryl halides with phenylboronic acid under phosphine-free and low Pdloading conditions.Graphical AbstractTwo novel nano pd-catalysts
摘要 通过叠氮化物官能化 SiO2 与炔丙醇 (A) 和炔丙胺 (B) 的“点击”反应,成功制备了两种新型三唑改性二氧化硅载体 A 和 B,其中点击三唑作为重要的功能实体,此外连接到分子连接器,提供金属配位能力作为优秀的螯合剂。用 Pd(OAc)2 处理得到的点击载体得到点击催化剂 A 和 B,它们在 Suzuki-Miyaura 偶联中得到了很好的表征,并在 H2O/EtOH 溶剂中的活性和可回收性方面进行了评估。催化剂A显示出更合理的结果,作为一种高效、可回收的催化剂,在无膦和低Pd负载条件下,用于各种芳基卤化物与苯基硼酸的偶联反应。