Synthèse d'additifs et de liants phosphonés (applications à la déformation plastique des métaux)

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF

Enhanced catalyst recovery in an aqueous copper-free Sonogashira cross-coupling reaction

We report the synthesis of a superparamagnetic nanoparticle MNP (c-Fe2O3/polymer) supported dendritic catalyst based on a bulky electron-rich phosphine Pd(II) complex. The high reactivity of this catalyst is described in a copper-free Sonogashira C–C cross-coupling reaction in water, and the significant role of surfactant additives is highlighted in the recovery study

Dendron-Functionalized Core–Shell Superparamagnetic Nanoparticles: Magnetically Recoverable and Reusable Catalysts for Suzuki C-C Cross-Coupling Reactions

A metallodendron functionalized with dicyclohexyldiphosphino palladium complex was synthesized. The metallodendron was grafted onto core–shell superparamagnetic nanoparticles (g-Fe2O3/polymer, 200–500 nm) to give optimal catalytic reactivity in cross-coupling reactions. The grafted nanoparticles were used as recoverable and reusable catalysts for Suzuki C-C cross-coupling reactions. They showed remarkable reactivity towards iodoand bromoarenes under mild conditions, and unprecedented reactivity towards chloroarenes. On completion of the catalytic reaction, the catalysts were readily recovered by using a simple magnet to attract the superparamagnetic grafted nanoparticles. Catalysts were recovered more than 25 times with almost no discernable loss of reactivity

Efficient strategy to increase the surface functionalization of core-shell superparamagnetic nanoparticles using dendron grafting

Core-shell c-Fe2O3/polymer 300 nm superparamagnetic nanoparticles, grafted by fluorescent dendrons using a convergent approach, showed an increase in their surface functionalization compared to grafting using a linear analogue