3 years ago

Palladium nanocatalysts in glycerol: Tuning the reactivity by effect of the stabilizer

Palladium nanocatalysts in glycerol: Tuning the reactivity by effect of the stabilizer
Palladium nanoparticles (PdNPs) prepared in neat glycerol containing TPPTS (tris(3-sulfophenyl)phosphine trisodium salt) or cinchona-based alkaloids (cinchonidine, quinidine) as capping agents, were applied as catalysts in fluoride-free Hiyama couplings and conjugate additions with the aim of evaluating the influence of the stabilizer in the catalytic reactivity. Therefore, PdNPs stabilized by phosphine favored CC cross-couplings, whereas those containing alkaloids showed enhanced suitability for CC homo-couplings and conjugate additions. The metal/stabilizer coordination mode, i.e. PdP dative bond and π-π interaction between quinoline moiety and palladium surface, is certainly key for the stabilization of different active metallic species and then promoting distinctive catalytic pathways.

Publisher URL: www.sciencedirect.com/science

DOI: S1566736717304156

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