Sol-gel entrapped Cu in a silica matrix: An efficient heterogeneous nanocatalyst for Huisgen and Ullmann intramolecular coupling reactions

- Silica-based nanostructures play a significant role in many applications in chemistry.
- SiO2-Cu nanocatalyst is a highly active catalyst for CuAAC and Ullmann reactions.
- The catalyst is truly heterogeneous and is reusable.
- No metal leaching.
- SiO2-Cu nanocatalyst is a step forward in the development of reusable catalysts.