Efficient and Recyclable Solid-Supported Pd(II) Catalyst for Microwave-Assisted Suzuki Cross-Coupling in Aqueous...

Area of Science:

• Catalysis
• Materials Science
• Organic Chemistry

Background:

• Solid-supported catalysts are vital for efficient organic synthesis.
• Palladium complexes are widely used in cross-coupling reactions.
• Chitosan offers a sustainable and versatile support material.

Purpose of the Study:

• To synthesize and characterize a novel solid-supported palladium(II) catalyst using chitosan.
• To evaluate the catalytic performance of the synthesized complex in Suzuki cross-coupling reactions.
• To assess the catalyst's recyclability, thermal stability, and efficiency under different conditions.

Main Methods:

• Synthesis of a palladium(II) complex immobilized on chitosan.
• Comprehensive characterization using spectroscopic (FTIR, XPS, EDX, ICP-AES) and thermal (TGA, DSC) techniques.
• Morphological analysis via electron microscopy (SEM, TEM) and surface area determination (BET).
• Catalytic activity assessment in Suzuki cross-coupling reactions in aqueous media, comparing conventional heating and microwave irradiation.

Main Results:

• The solid-supported palladium(II) catalyst was successfully synthesized and thoroughly characterized.
• The catalyst exhibited high activity and stability in Suzuki cross-coupling reactions, particularly under microwave irradiation.
• The catalyst demonstrated excellent recyclability, remaining active for five consecutive runs without significant loss of performance.
• High turnover number (19,019) and turnover frequency (114,114 h⁻¹) were achieved under microwave conditions.

Conclusions:

• The developed chitosan-supported palladium(II) catalyst is a highly efficient, recyclable, and stable material for Suzuki cross-coupling.
• Microwave irradiation significantly enhances the catalytic performance and recyclability of the catalyst.
• This solid-supported catalyst presents a promising green chemistry approach for organic synthesis applications.