Synthesis of Fe3O4-supported Schiff base Cu (II) complex: a novel efficient and recyclable magnetic nanocatalyst for one-pot three-component synthesis of quinolin-5-one, chromene-3-carbonitrile and phthalazine-5,10-dione derivatives

A novel Hercynite‐supported tetradentate Schiff base complex of manganese catalyzed one‐pot annulation reactions

“…[ 62,63 ] Regarding the FT‐IR spectra of Hercynite@SiO 2 –Schiff base (Figure 1e), four bonds appeared at around 3428, 2823–2958, 1630, and 1603 cm −1 , which are assigned to the bending vibration of OH groups, and stretching vibrations of CH, CN, and CC groups, respectively, confirm the successful immobilization of Schiff base ligand on the surface of the silica‐modified Hercynite support. [ 65 ] It is worth mentioning that, as compared to 1,2‐bis(3‐formylphenoxy)ethane and Schiff base ligand, CO and CN stretching vibration bands disappeared or overlapped with the major SiO and SiOSi broad bands, so that they cannot be detected in this spectrum. Notably, the high shifts on the CN peak in the [Hercynite@SiO 2 –Schiff base–Mn(II)] (Figure 1f) to lower wavenumbers—in comparison to Hercynite@SiO 2 –Schiff base—are due to π backbonding effect that indicates the proper complexation of Mn(II) with the azomethine nitrogen atoms of the Schiff base ligand, confirming the successful formation of [Schiff base–Mn(II)] catalytic complex over Hercynite@SiO 2 nanomagnetic core–shell support.…”

One-Pot, Green Synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones by ZnFe2O4 Nanoparticles an Efficient Nanocatalyst

“…Additionally, some multi component reactions including C-C bond formation, coupling reaction, Knoevenagel condensation reaction, cycloaddition, dehydration esteri cation has been reported [38,39]. In the last few years, various catalysts have been used for the synthesis of 1H-pyrazolo [1,2-b] phthalazine-5,10-dione derivatives involving three-component condensation reaction between phthalhydrazide, malononitrile, aldehyde such as Fe 3 O 4 @SiO 2 -imine/phenoxy-Cu(II) [7], Fe 3 O 4 @SiO 2 @CPTES@Cu(II)Schiff base complex [40], [Bu 3 NH] [HSO 4 ] [41], agro-waste extract WEMPA [42], (DIPEAc) [43], β-cyclodextrin [44], Na 2 eosin Y [45], 2-AP(2-aminopyridine) [46], CuO NPs [14], Cu(OTf) 2 [47], BW 12 -ILMNPs [48], ZrO 2 NPs [49], nano-PbO [25] and BSA [35].…”

One-pot synthesis of chromenes in the presence of nano-cellulose/Ti(IV)/Fe3O4 as natural-based magnetic nano-catalysts under solvent free conditions

“…The use of magnetic catalysts in nano-dimensions, in comparison with other catalysts presented for the preparation of these compounds are very suitable and has been considered by many researchers today. 6,7 Increasing the efficiency and reducing the reaction time by using environmentally friendly catalysts, and also preparing high-purity organic compounds were the main reasons for this research. Herein, we report a simple and efficient method for the synthesis and preparation of various chromenes using various aldehydes by natural based nanocellulose/Ti (IV) /Fe 3 O 4 catalyst.…”