Sustainable conversion of carbon dioxide into novel 5-aryldiazenyl-1,2,4-triazol-3-ones using Fe3O4@SP-vanillin-TGA nanocomposite

Abstract

Abstract A series of novel 5-aryldiazenyl-1,2,4-triazol-3-ones are synthesized at room temperature in short reaction time, and excellent yields via four-component reaction between 4-aryldiazenyl-salicylaldehydes, ammonium acetate, arylhydrazine, and carbon dioxide using bis(thioglycolic acid)-vanillin (2,2′-(((4-hydroxy-3-methoxyphenyl)methylene)bis(sulfanediyl))diacetic acid)‐functionalized silica-coated Fe3O4 magnetic nanocomposite (Fe3O4@SP-vanillin-TGA MNCs). The present protocol offers several advantages such as gentle reaction conditions, excellent performance, simple fabrication, separation methods, and reduction of detrimental environmental consequences. The catalyst could be easily recovered and reused for six runs with nearly steady activity. The structures of the synthesized 5-aryldiazenyl-1,2,4-triazol-3-ones have been confirmed with the aid of using 1H, 13C NMR, and fourier transform infrared spectral data and elemental analyses.