Aqueous Media Synthesis of Pyrano[3,2-c]chromen Derivatives Using Magnesium Oxide Nanoparticles as a Recyclable Catalyst

Abstract

Here, the synthesis of MgO nanopowders via a simple precipitation method is defined. The morphology, phase identification, particle size distribution and specific surface area of the sample was investigated by FE-SEM, TEM, XRD, DLS, and BET techniques. The structural parameters were determined through XRD pattern. The sample crystallized in a pure cubic phase with the average crystallite size of 55 nm. The micro-strain (ε) and dislocation density (δ) of the sample were also calculated to be 0.1153 and 3.306 × 10⁻⁴, respectively. The catalyst has a specific surface area and of 26.7 m²g⁻¹. The catalytic activity of MgO nanopowders was studied in the three-component condensation of aldehydes, 4-hydroxycoumarin, and malononitrile in aqueous media. A range of aromatic aldehydes undergoes the reaction to produce a series of pyrano[3,2-c]chromen derivatives in good yields.

Keywords:

• Formylaryl benzenesulfonates
• MgO nanopowders
• pyrano[3,2-c]chromen
• (pyrano[3,2-c]chromen-4-yl)aryl benzenesulfonate

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors are indebted to the Islamic Azad University, Najafabad Branch for financial support of this research.