# Expression of concern: Recyclable mesalamine-functionalized magnetic nanoparticles (mesalamine/GPTMS@SiO2@Fe3O4) for tandem Knoevenagel–Michael cyclocondensation: grinding technique for the synthesis of biologically active 2-amino-4H-benzo[b]pyran derivatives

## TL;DR

This paper addresses concerns about a study on using magnetic nanoparticles for a chemical reaction to make biologically active compounds.

## Contribution

The paper raises an expression of concern regarding the original study's methodology or findings.

## Key findings

- The paper highlights potential issues with the original research on magnetic nanoparticle synthesis.
- It questions the validity or reproducibility of the reported chemical reaction results.

## Abstract

Expression of concern for ‘Recyclable mesalamine-functionalized magnetic nanoparticles (mesalamine/GPTMS@SiO2@Fe3O4) for tandem Knoevenagel–Michael cyclocondensation: grinding technique for the synthesis of biologically active 2-amino-4H-benzo[b]pyran derivatives’ by Mahdiyeh Partovi et al., RSC Adv., 2023, 13, 33566–33587, https://doi.org/10.1039/D3RA06560J.