Porous carbon/FeO nanocomposite as a new magnetically recoverable catalyst for the preparation of polyhydroquinolines.

A porous carbon/FeO nanocomposite (PC/FeO nanocomposite) was prepared through the pyrolysis of peanut shells as biowaste with ferrous ferric oxide to give a new magnetically recoverable catalyst. In the designed nanocomposite, magnetic iron oxide nanoparticles are properly distributed on the surface and cavities of porous carbon obtained from biomass. Increasing the active surface and magnetic recovery capability results in catalytic synergy, thereby promoting the reaction with an appropriate catalytic effect.

Fabrication of a novel graphene oxide based magnetic nanocomposite and its usage as a highly effectual catalyst for the construction of ,'-alkylidene bisamides.

At first, a novel graphene oxide-based magnetic nanocomposite namely Si-propyl-functionalized , , , -tetramethylethylenediamine- , -diium hydrogen sulfate anchored to graphene oxide-supported FeO (nano-[GO@FeO@R-NHMe][HSO]) was fabricated. After full characterization of the nanocomposite, its catalytic performance was examined for the solvent-free construction of ,'-alkylidene bisamides from aryl aldehydes (1 eq.) and primary aromatic and aliphatic amides (2 eq.

The preparation of [1,2,4]triazolo[1,5-]pyrimidines catalyzed by Schiff base zinc(ii) complex supported on magnetite nanoparticles under mild conditions.

Nano-[CuFeO@SiO/propyl-1-(-vanillinaldimine)][ZnCl] was prepared by placing a Schiff base zinc(ii) complex on a magnetite core and fully characterized by various analyses such as FT-IR, FE-SEM, EDAX, SEM-coupled EDX, TGA, VSM and TEM. The complexes supported on silica-coated magnetite copper ferrite nanoparticles were used as a reusable catalyst for the synthesis of 5-methyl-,7-diphenyl-4,7-dihydro-[1,2,4]triazolo[1,5-] pyrimidine-6-carboxamides resulting in 40% to 96% yield in the reactions of various aldehydes, acetoacetanilide, and 3-amino-1,2,4-triazole at 60 °C under solvent-free conditions. The zinc complex can change its structure from tetrahedral to square planar and catalyze the reaction.

Multicomponent synthesis of pyrimido[4,5-b] quinolines over a carbocationic catalytic system.

Trityl chloride (TrCl) was efficiently used as a neutral catalyst for the multicomponent cyclization reaction of an aldehyde with dimedone and 6-amino-1,3-dimethyluracil for the preparation of pyrimido[4,5-b] quinolines in chloroform under reflux condition.

TiO/porous carbon as a new nanocomposite and catalyst for the preparation of 4-pyrimido[2,1-]benzimidazoles.

A nano TiO/porous carbon nanocomposite (TiO/PCN) was designed by the pyrolysis of peanut shells as bio waste with nano titanium dioxide. In the presented nanocomposite, titanium dioxide is properly placed in the positions and pores of the porous carbon, so that it acts as an optimal catalyst in the nanocomposite structure. The structure of TiO/PCN was studied by various analyses such as Fourier transform infrared spectroscopy (FT-IR), energy-dispersive X-ray Spectroscopy (EDX), scanning electron microscopy (SEM), SEM coupled EDX (SEM mapping), transmission electron microscopy (TEM), X-ray fluorescence (XRF) and BET.

Synthesis of Novel Pyrimido[4,5-] Quinolines Containing Benzyloxy and 1,2,3-Triazole Moieties by DABCO as a Basic Catalyst.

DABCO was used as a basic and inexpensive catalyst for the synthesis of some new benzyloxy pyrimido[4,5-]quinoline derivatives and 1,2,3- triazole-fused pyrimido[4,5-]quinolines by the one-pot multi-component reaction of various benzyloxy benzaldehydes or benzylic -1,2,3-triazol-4-yl-methoxy benzaldehydes with dimedone and 6-amino-1,3-dimethyluracil at 90 °C under the solvent-free condition.

Retraction: Design of 1-methylimidazolium tricyanomethanide as the first nanostructured molten salt and its catalytic application in the condensation reaction of various aromatic aldehydes, amides and β-naphthol compared with tin dioxide nanoparticles.

[This retracts the article DOI: 10.1039/C5RA02718G.].

Retraction: Boric acid in magnetized water: clean and powerful media for synthesis of 3,4-dihydropyrimidin-2(1)-ones.

[This retracts the article DOI: 10.1039/D1RA03769B.].

Retracted Article: Boric acid in magnetized water: clean and powerful media for synthesis of 3,4-dihydropyrimidin-2(1)-ones.

Water was magnetized an external magnetic field and employed, for the first time, as a solvent in green preparation of 3,4-dihydropyrimidin-2(1)-ones by the one-pot three-component condensation reaction using boric acid as a catalyst. Shorter reaction times, higher yields, and cleaner reaction profiles were some advantages of using magnetic water.

Nano-[FeO@SiO/-propyl-1-(thiophen-2-yl)ethanimine][ZnCl] as a nano magnetite Schiff base complex and heterogeneous catalyst for the synthesis of pyrimido[4,5-]quinolones.

Nano-[FeO@SiO/-propyl-1-(thiophen-2-yl)ethanimine][ZnCl] as a nano magnetite Schiff base complex was designed and fully characterized by various analyses such as Fourier transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), differential thermal gravimetric analysis (DTA), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), and transmission electron micrographs (TEM). The presented nano magnetite Schiff base complex was used as a heterogeneous catalyst for the synthesis of pyrimido[4,5-]quinolones by the reaction of aryl aldehyde, dimedone and 6-amino-1,3-dimethyluracil in EtOH : HO (7 : 3) as a solvent at 60 °C.