GO-Fe₃O₄-Ti^(IV) as an efficient magnetic catalyst for the synthesis of bis(indolyl)methanes and benzo[a]xanthen-11-one derivatives

Abstract

In this study, a new and efficient magnetic composite was synthesized based on graphene oxide (GO). Initially, GO was coated with magnetite, and then Ti^(IV) was fixed on GO-Fe₃O₄ via a covalent graft. The magnetic composite was characterized by FT-IR, EDS, XRD, FE-SEM, TEM, VSM and TGA techniques. It was designed as a compound with strong and recoverable catalytic properties. The prepared GO-Fe₃O₄-Ti^(IV) emerged to be of high catalytic activity for the synthesis of bis(indolyl)methane and benzo[a]xanthen-11-one derivatives under mild conditions. The stability and reusability of the catalyst were investigated too. All of the data proved that GO-Fe₃O₄-Ti^(IV) could be recycled five times without a marked loss of activity.

Keywords:

• Bis(indole)methane
• Benzo[a]xanthen-11-one
• Heterogeneous Lewis acid
• magnetic catalyst
• GO-based catalyst

Additional information

Funding

The authors thank the Research Council of Yazd University for the financial support.