3D Porous Polymeric-Foam-Supported Pd Nanocrystal as a Highly Efficient and Recyclable Catalyst for Organic Transformations

The efficient recovery of noble metal nanocrystals used in heterogeneous organic transformations has remained a significant challenge, hindering their use industry. Herein, highly catalytic Pd nanoparticles (NPs) were first prepared having yield >98% by novel hydrothermal method using PVP as the reducing cum stabilizing agent that exhibited excellent turnover frequencies ?38,000 h–1 for Suzuki–Miyaura cross-coupling and ?1200 reduction nitroarene compounds benign aqueous reaction medium. NPs more aryl with electron-donating substituents than ones. Further, to improve recyclability, strategy was developed embed these on mechanically robust polyurethane foam (PUF) time “dip-catalyst” (Pd-PUF) containing 3D interconnected 100–500 ?m pores constructed. PUF chosen support an expectation reduce fabrication cost production is already commercialized. Pd-PUF could be easily separated from aliquot reused without any loss activity because leaching found negligible various mixtures. We show over 50 cycles maintaining similar activity. further demonstrate scale-up single-reaction 1.5 g reaction.