Palladium nanoparticles supported on poly (N-vinylpyrrolidone)-grafted silica as new recyclable catalyst for Heck cross-coupling reactions

Poly(vinylpyridine)‐Grafted Silica Containing Palladium or Nickel Nanoparticles as Heterogeneous Catalysts for the Sonogashira Coupling Reaction

“…[49] And in 2009, Han et al used a poly(vinylpyrrolidone)-Ru-complex-grafted silica as a catalyst for the hydrogenation of aromatics. [50] In continuation of our previous projects on heterogeneous Pd catalysts based on polymeric supports, [51][52][53][54] polymer-grafted silica, [55][56][57] and our related publication on the synthesis and application of poly(4-vinylpyridine)ÀPd-grafted silica (Si-P4VPy-Pd) as a new heterogeneous catalyst in Heck and Suzuki crosscoupling reactions, [58] herein we report a Sonogashira crosscoupling reaction that uses Si-P4VPy-Pd as well as our newly synthesized and very promising comparatively cheap Si-P4VPy-Ni catalyst.…”

Synthesis and application of polyvinylimidazole-based Br{\o}nsted acidic ionic liquid grafted silica as an efficient heterogeneous catalyst in the preparation of quinoxaline derivatives

“…46,47 The aminopropylsilica (10 g, 9.5 mmol amino groups) was suspended in dry THF (200 mL) and the suspension cooled to 0 • C. Triethylamine (1.5 g, 0.015 mol) was added, followed by propenoyl chloride (1.1 g, 0.012 mol) over 1 h. The temperature of the reaction reached 5…”

Polymers for Green C–C Couplings

“…The catalyst is recyclable by filtration and some mechanistic tests (hot filtration) seem to indicate that leached species are not responsible for the activity observed. [43] Scheme 7. Reactions catalyzed by Pd supported on polyaniline (PANI).…”