One pot preparation of PVA-sodium alginate-PdCl2 with excellent recyclability properties as a catalyst for Heck cross-coupling reactions

Developing polyvinyl alcohol-sodium alginate (PVA-SA) polymer as palladium chloride (PdCl2) support could produce an excellent recyclable catalyst for Heck reactions. Nevertheless, several tedious steps and toxic chemicals are required to synthesise PVA-SA metals. The PVA-SA polymer manufactured in this study is a cost-efficient commercial polymer utilisable in novel polymer-supported PdCl2 catalyst designs. The present study employed an ultrasonic-assisted method to produce a PVA-SA-supported PdCl2 catalyst in one pot. The highest PdCl2 concentration in the ultrasonic-assisted PVA-SA-PdCl2 catalyst synthesised was 7.852 mg/L. Subsequently, the catalytic behaviours of the catalyst in Heck cross-coupling reactions of aryl halides with styrene were investigated. The catalytic reaction achieved a 100% conversion rate when 1 mmol% catalyst load, K2CO3 base, DMA solvent, and a 60 min reaction at 165 degrees C were employed. Moreover, the catalyst exhibited excellent reproducibility and recyclability (over 11 cycles).

Automated summary

This study developed a PVA-SA-PdCl2 catalyst using an ultrasonic-assisted method, which exhibited excellent recyclability and reproducibility. The catalytic reaction achieved a 100% conversion rate when employing a 1 mmol% catalyst load, K2CO3 base, DMA solvent, and a 60 min reaction at 165 degrees C.