Magnetic Fe(OH)3@Fe3O4 nanoparticles were successfully prepared and characterized. This magnetic nanocomposite was employed as an efficient, reusable, and environmentally benign heterogeneous catalyst for the direct amidation of alcohols with amine hydrochloride salts. Several derivatives of primary, secondary and tertiary amides were synthesized in moderate to good yields in the presence of this catalytic system. The catalyst was successfully recycled and reused up to six times without significant loss of its catalytic activity.
The highly efficient transamidation of primary amides, phthalimide, urea and thiourea with amines catalyzed by magnetic Fe3O4@Fe(OH)3 nanoparticles is described.
In the presence of a catalytic amount of Fe3O4‐Guanidine acetic acid (GAA) nanoparticles, efficient transamidation of several amides with various amines is described under solvent‐free conditions. Fe3O4‐Guanidine acetic acid nanoparticles provide the first example of a magnetically recoverable organocatalyst for transamidation in the highest catalytic activity. The catalyst could be simply recycled with the assistance of an external magnet and reused for six runs without significant loss of its catalytic activity.
Disproportionate rosin (DPR) is a mixture of rosin acids with dehydro-abietic acid as its major component. Alkaline salts of DPR are used as emulsifier surfactant in emulsion polymerization reactions. In this work, synthesis of DPR by the use of palladium nanoparticles loaded on activated carbon was studied. The nanocatalyst was characterized by TEM, SEM, XRD, N 2 adsorptiondesorption and AAS. The reusability of the prepared nanocatalyst was successfully examined three times with only a very slight loss of catalytic activity.
A new, powerful and recyclable copper catalyst were prepared by heterogenization of copper chloride using of Fe 3 O 4 nano particles modified with citric acid as a linker. This system can catalyze reduction of nitroaren compound to aniline derivatives in the presence of Sodium borohydride as a reduction agent in moderate to good yields. In addition, easy separation and recoverable with an external permanent magnet is the dominant properties of this catalyst (Cu 2+ -CA@Fe 3 O 4 ).
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