Solid-supported cross-coupling catalysts derived from homogeneous nickel and palladium coordination complexes.

Area of Science:

• Catalysis
• Organometallic Chemistry
• Materials Science

Background:

• Homogeneous catalysts based on nickel(II) and palladium(II) salen-type complexes are effective for cross-coupling reactions.
• Developing robust and recyclable heterogeneous catalysts is crucial for sustainable chemical synthesis.

Purpose of the Study:

• To prepare and characterize solid-supported nickel and palladium catalysts derived from non-symmetrical salen-type coordination complexes.
• To evaluate the efficacy of these heterogeneous catalysts in carbon-carbon cross-coupling reactions.
• To compare the performance of solid-supported catalysts with their homogeneous analogues.

Main Methods:

• Synthesis of nickel(II) and palladium(II) non-symmetrical salen-type coordination complexes using improved methods.
• Immobilization of the complexes onto solid supports.
• Characterization of the complexes and solid-supported catalysts using spectroscopic techniques.
• Application of the catalysts in Tamao-Kumada-Corriu (nickel) and Heck (palladium) reactions.
• Single-crystal structure determination of the metal complexes.

Main Results:

• Solid-supported nickel and palladium catalysts were successfully prepared and characterized.
• The nickel catalyst demonstrated effectiveness in room-temperature Tamao-Kumada-Corriu reactions.
• The palladium catalyst showed efficacy in Heck reactions at elevated temperatures.
• Comparisons indicated comparable or improved performance of the solid-supported catalysts.

Conclusions:

• Solid-supported nickel and palladium salen-type complexes serve as effective heterogeneous catalysts for carbon-carbon cross-coupling reactions.
• These heterogeneous systems offer a viable alternative to homogeneous catalysts, with potential for improved recyclability and process efficiency.
• The study provides structural insights into the nickel and palladium complexes.