Graphene Oxide Functionalized Organic-Inorganic Hybrid (GO–Si–NH₂–PMo): An Efficient and Green Catalyst for the Synthesis of Tetrahydrobenzo[b]pyran Derivatives

Abstract

In this study, a graphene oxide (GO) functionalized organic-inorganic hybrid was prepared by covalently immobilization of organic (3-aminopropyltrimethoxysilane) and inorganic (H₃PMo₁₂O₄₀) groups on the basal plane of GO. Structure of catalyst was characterized with different analysis such as FT-IR, SEM, TEM, EDS, WDX, XRD, and TGA. All analyses approve the successful covalently immobilization of organic and inorganic parts on the GO. The activity of catalyst has been tested for the synthesis of tetrahydrobenzo[b]pyran derivatives under solvent-free condition in short reaction time and good to excellent yields.

Highlights

• Efficient synthesis of tetrahydrobenzo[b]pyran derivatives

• Green and heterogeneous organic and inorganic hybrid catalyst

• Preparation of a graphene oxide functionalized heteropolyacid

• Reusable catalyst for at least for 5 runs

Keywords:

• Graphene oxide
• heteropoly acid
• Keggin
• tetrahydrobenzo[b]pyran

Disclosure statement

No potential conflict of interest was reported by the authors.