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Synthesis and characterization of sulfamic acid supported on Fe 3 O 4 nanoparticles: A green, versatile and magnetically separable acidic catalyst for oxidation reactions and Knoevenagel condensation
Author(s) -
Shiri Lotfi,
Narimani Hojatollah,
Kazemi Mosstafa
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3927
Subject(s) - sulfamic acid , knoevenagel condensation , chemistry , malononitrile , catalysis , thermogravimetric analysis , nuclear chemistry , heterogeneous catalysis , inorganic chemistry , polymer chemistry , organic chemistry
Sulfamic acid immobilized on diethylenetriamine functionalized Fe 3 O 4 nanoparticles (SA‐DETA‐Fe 3 O 4 ) was successfully prepared and characterized by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), vibrating sample magnetometer (VSM), thermo gravimetric analysis (TGA), X‐Ray diffraction (XRD) and scanning electron microscopy (SEM). The sulfamic acid was found as a magnetically separable and highly active catalyst for the oxidative coupling thiols, oxidation of sulfides. Furthermore, the SA‐DETA‐Fe 3 O 4 showed the high catalytic activity in Knoevenagel condensation of aromatic aldehydes with active methylene compounds (malononitrile and ethyl cynoacetate). The nanosolid catalyst could be easily recovered by a simple magnetic separation and reused for many cycles without deterioration in catalytic activity.