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Zinc oxide nanoparticles (ZnO NPs, ca. 22 nm) were used as an effective catalyst in the solvent-free, three-component couplings of aldehydes, aromatic amines and dialkyl phosphites at room temperature to produce various a-amino phosphonates. Compared to known methods, satisfactory results were obtained with high yields through a simple experimental procedure. The catalyst was recycled and reused five times with minor decrease in its catalytic activity.

An effective route to novel 5-hydroxy-1,5-dihydro-2Hpyrrol-2-one is described which involves the reaction of an enamine, derived from addition of a secondary amine to dibenzoylacetylene, with an arylsulfonyl isocyanate.

In this article, we demonstrated a facile method to fabricate a new type of magnetic recyclable Fe3O4@NH2‐MIL‐101(Cr) adsorbent for removal of cationic dye of methylene blue (MB) through the decoration of Fe3O4@NH2 core‐shell nanoparticles on the surface of metal–organic frameworks. The synthesis and immobilization processes were characterized by Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), Zeta potential, and Field Emission Scanning Electron Microscopy (FE‐SEM). The influence of several parameters such as solution pH, dye concentration, contact time, and temperature were studied. The Fe3O4@NH2‐MIL‐101(Cr) can recycled and reused several times. The maximum adsorption capacity of adsorbent for removal of MB under the optimum operational conditions was found to be 370.3 mg/g. The adsorption kinetic data described well with the pseudo‐second‐order model, and the equilibrium data fitted well to the Langmuir isotherm. The results of thermodynamic studies illustrate that the adsorption process was endothermic and spontaneous in nature. The experimental results suggest that Fe3O4@NH2‐MIL‐101(Cr) has potential applications in environmental management.