Sodium alginate-modified copper catalytic membrane for carbene N-H insertion

Area of Science:

• Materials Science
• Catalysis
• Green Chemistry

Background:

• Developing efficient and recyclable catalytic systems is crucial for sustainable chemical synthesis.
• Heterogeneous catalysts offer advantages in separation and reusability over homogeneous catalysts.
• N-H insertion reactions are important for synthesizing nitrogen-containing heterocyclic compounds.

Purpose of the Study:

• To develop a novel copper-based catalytic membrane (Cu@SA-CM) using sodium alginate.
• To investigate the catalytic activity and stability of Cu@SA-CM for N-H insertion reactions.
• To evaluate the potential of Cu@SA-CM for continuous-flow and sustainable applications.

Main Methods:

• Fabrication of Cu@SA-CM via surface cross-linking with sodium alginate.
• Characterization using FTIR, FESEM, EDS, and XPS.
• Testing catalytic performance in N-H insertion of carbenes into N-heterocycles under mild conditions.
• Evaluation in a continuous-flow system over multiple cycles.

Main Results:

• Uniform dispersion of copper (predominantly Cu²⁺) on the membrane confirmed.
• High selectivity and efficiency in catalyzing N-H insertion reactions.
• Consistent catalytic performance over 20 cycles in a continuous-flow system.
• Demonstrated robust activity and stability in gram-scale synthesis and recycling tests.

Conclusions:

• Cu@SA-CM is a stable and recyclable heterogeneous catalyst for N-H insertion reactions.
• Sodium alginate plays a key role in stabilizing the catalytic membrane through coordination and gel network formation.
• The developed catalytic membrane shows significant potential for sustainable and scalable chemical synthesis.