Development of a new palladium catalyst supported on phenolic resin

Abstract

A phenolic resin-supported palladium catalyst, in which hydroxy groups contribute to the stabilization of palladium nanoparticles, was developed. The catalyst could be used repeatedly, and thus has a large turn over number (TON). When a composite of polyethylene terephthalate and phenolic resin was employed as a support, the catalyst was easily deformed on demand.Solid-supported catalysts have played an important role in industrial chemistry because they can be easily separated and recovered from the reaction mixture.1 Solid-supported catalysts do not always work heterogeneously particularly for reactions using aryl iodides as substrates (Scheme 1). 2 This reaction is initiated by the oxidative addition of iodobenzene to Pd(0), which is in the form of Pd (0) nanoparticles on a scaffold. The stabilized adduct dissolves in a solution, and serves as the actual active species for the homogeneous catalysis of the reaction. After C C bond formation, followed by reductive elimination, the Pd (0)

Palladium Nanoparticles Tethered in Amine-Functionalized Hypercrosslinked Organic Tubes as an Efficient Catalyst for Suzuki Coupling in Water

“…It is pertinent to mention that the model Suzuki reaction, when compared with Pd/MCM-41 (2 wt %·Pd; 5-8 nm) and Pd/C (2 wt % Pd; 10-15 nm) in water, shows much lower activity than Pd/PP-3, signifying the importance of amine functionality decorated in hydrophobic PP-3 for the stabilization of active sites, as well as organometallic intermediates. Similarly, Pd nanoparticles stabilized by phenol resign also show comparable catalytic activity as that of Pd/PP-3, which again proves that the surface functional sites could endow a significant binding interaction with guest metal particles for stabilization and improvement in its catalytic property [37,38].…”