Ni–citric acid coordination polymer as a practical catalyst for multicomponent reactions

Abstract

Coordinative polymers (CP) are a subclass of Metal–organic frameworks (MOFs) with porous microstructures which have been widely synthesized in recent years and applied in various fields especially in catalysis science. In this work Coordinative polymers (CP) of nickel and citric acid (CA) was prepared as a new catalyst (Ni-CP) and applied in organic multicomponent reactions. The obtained catalyst was characterized by SEM, WDX, EDS, AAS, FT-IR, XRD and BET analysis. N2 adsorption–desorption isotherms indicate good BET surface area for Ni-CP; therefore can be employed as an efficient catalyst in multicomponent reactions for the synthesis of polyhydroquinoline and 2,3-dihydroquinazolin-4(1H)-one derivatives. Finally, this catalyst was recovered and reused several consecutive times.

Immobilization of nickel on Kryptofix 222 modified Fe3O4@PEG core‐shell nanosphere for the clean synthesis of 2‐Aryl‐2,3‐dihydroquinazolin‐4(1H)‐ones

“…According to previous literature, [ 55 ] a plausible mechanism for performing this reaction in the presence of Lewis acid can be suggested in Figure 5. This mechanism has several stages, the first of which involves the activation of the aldehyde by the Ni@KP222/Fe 3 O 4 @PEG catalyst.…”

A novel cubic Zn‐citric acid‐based MOF as a highly efficient and reusable catalyst for the synthesis of pyranopyrazoles and 5‐substituted 1H‐tetrazoles

“…These absorption peaks were not observed in the spectra of the prepared Zn‐CA‐MOFs, whereas the Zn‐CA‐MOF spectrum showed two absorption peaks related to the vibration of the C=O bonds of aliphatic carboxylic acid groups at 1560 cm −1 . [ 44 ] The carbonyl absorption peak shifts, from 1703 cm −1 in the pure citric acid to the lower wavenumber (1560 cm −1 ) in the final Zn‐CA‐MOFs, represent the interaction between Zn and citric acid (Figure 1c). In addition, the peaks at the region of 2922–2999 cm −1 are the most important peaks that can be regarded as the characteristic of the aliphatic C─H stretching vibrations.…”

“…The obtained results effectively coincide with XRD patterns simulated from powder X-ray data of porous Zn-based MOFs with a cubic crystal phase, showing that the structure agrees with the literature reports. [45][46][47] The EDX spectrum results indicate the presence of Zn (9.53 W %), O (45.17 W %), carbon (32.48 W %), and nitrogen (12.52 W %) species in the obtained porous Zn-CA-MOFs' catalyst (Figure 3). These observations support the high purity of the prepared catalyst.…”

Fe3O4/SiO2 decorated trimesic acid-melamine nanocomposite: A reusable supramolecular organocatalyst for efficient multicomponent synthesis of imidazole derivatives

“…The results of using different conditions in model reaction presented in entries (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) Although the reaction time with 15 or 20 mg of the catalyst is slightly less than the reaction time with 10 mg of catalyst, no noticeable change in e ciency was seen. For this reason, the optimal amount of catalyst was chosen to be 10 mg. By using the introduced catalyst components separately in the model reaction, it can be concluded that the prepared nano-catalyst shows better results in proceeding the three-component synthesis of imidazole derivatives.…”

“…The total synthetic approach adjusts to the basic principles of sustainable chemistry that purpose to reduce the production of hazardous materials under various reaction conditions [1][2][3] . The designed-procedures for the preparation of nanomaterials including magnetic nanoparticles and their catalytic activities are entirely veri ed in the eld of greener and atom-economic reactions especially multicomponent reactions [4][5][6][7] . On the other hand, the use of magnetic decorated organic species is gaining signi cant attention in the eld of catalysis for organic transformations, mainly due to opportunities in providing new structural changes [8][9][10][11][12] .…”