CoFe₂O₄–SiO₂–SO₃H nanocomposite as a magnetically recoverable catalyst for oxidative bromination of alkynes

ABSTRACT

A hybrid catalyst has been prepared by incorporating sulfonic acid onto cobalt ferrite magnetic nanoparticles. The catalyst was successfully applied for rapid (20 min) synthesis of α,α-dibromoketones directly from alkynes and NBS. The reaction works well in the presence of 10 wt% of the catalyst at room temperature to produce the desired products in high yield. The catalyst could be recovered using an external magnet and reused without appreciable change in activity.

GRAPHICAL ABSTRACT

KEYWORDS:

• α,α-Dibromoketones
• catalyst
• cobalt ferrite MNPs
• NBS
• sulfonic acid

Acknowledgment

The authors would like to acknowledge the support from Department of Chemistry, Gauhati University, SAIF-GU, SAIF-NEHU, CIF-IITG for all the analytical facilities during the course of investigations.

Additional information

Funding

Financial support from DST [Grant No. SR/NM/NS-18/2011(G)] is gratefully acknowledged. MD thanks UGC for a research fellowship.