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Relevant academic research and scientific papers

Synthesis of the nano-magnetic ionic liquid based on caffeine and its catalytic application in the synthesis of xanthenes

In this research, a novel nano-sized cube-shaped magnetic ionic liquid based on caffeine was synthesized and characterized by various spectroscopic and analytical techniques including Fourier transform infrared spectroscopy, Raman spectroscopy, proton NMR

Synthesis, NMR spectral, docking and antimicrobial studies of some 12-aryl-9,9-dimethyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one tosylhydrazones

A new series of 12-aryl-9,9-dimethyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one tosylhydrazones (7-12) have been synthesized from the corresponding 12-aryl-9,9-dimethyl-8,9,10,12-tetrahydrobenzo[a]-xanthen-11-one (1-6) and p-toluenesulfonyl hydrazide by condensation reaction. The structure of the synthesized compounds 7-12 were confirmed by their spectral analysis such as FT-IR, 1H NMR, 13C NMR, HOMOCOSY, HSQC and HMBC. Docking study was conducted to predict the significant interactions of the six compounds with the protein 1JIJ for its antibacterial activity. The docking results provided that the compounds 9 and 12 possess high inhibition constant as well as high binding energy. The synthesized compounds were screened for their in vitro antibacterial and antifungal activity and the observed activity is found to be moderate compared to the standard drugs.

Effect of heteropoly acids on structure, electrochemical behavior, acidic properties and catalytic activity of zwitterionic-type ionic liquid

Zwitterionic-type ionic liquid (CDIPS) was prepared by the reaction of 1,1′-carbonyldiimidazole (CDI) with 1,3-propane sultone (PS). 1H NMR, XRD, FT-IR and CHNS confirm that 1,3-propane sultone was attached to two N atoms. Inorganic–organic hyb

Phosphomolybdic acid supported on Schiff base functionalized graphene oxide nanosheets: Preparation, characterization, and first catalytic application in the multi-component synthesis of tetrahydrobenzo[a]xanthene-11-ones

New Schiff base (SB) functionalized graphene oxide (GO) nanosheets containing phosphomolybdic counter-anion H2PMo12O40ˉ (H2PMo) were successfully prepared by grafting of 3-aminopropyltriethoxysilane (

HAp-encapsulated γ-Fe2O3-supported dual acidic heterogeneous catalyst for highly efficient one-pot synthesis of benzoxanthenones and 3-pyranylindoles

A novel method is reported for the synthesis of benzoxanthenone and 3-pyranylindole derivatives via one-pot three-component reactions using a newly synthesized HAp-encapsulated γ-Fe2O3-supported dual acidic heterogeneous catalyst, as a reusable and highly efficient nanocatalyst. In this protocol the use of the nanocatalyst provided a green, useful and rapid method to generate products in short reaction times (4–20?min) and in excellent yields (87–96%). The paramagnetic nature of the catalyst provided a simple, trouble-free and facile approach for the separation of the catalyst by applying an external magnet, and it could be used in eight cycles without significant loss in catalytic efficiency.

New nano-Fe3O4-supported Lewis acidic ionic liquid as a highly effective and recyclable catalyst for the preparation of benzoxanthenes and pyrroles under solvent-free sonication

A novel magnetic nanomaterial-immobilized Lewis acidic ionic liquid was successfully synthesized by the covalent embedding of 3-(3-(trimethoxysilyl)propyl)-1H-imidazol-3-ium chlorozincate (ii) ionic liquid to the surface of Fe3O4 nanoparticles. The material was then characterized by FT-IR, SEM, TEM, TGA, ICP-OES, Raman, and EDS. Its performance as a new-generation Lewis acidic catalyst was also examined on the ultrasound-mediated synthesis of benzoxanthenes and pyrroles. Upon completion, the catalyst was simply recovered by an external magnet for multiple reuses without significant lessening of catalytic performance.

Rapid, efficient and solvent-free synthesis of (un)symmetrical xanthenes catalyzed by recyclable sulfated polyborate

The present study describes a rapid, simple and straightforward approach to the synthesis of 1,8-dioxo-octahydroxanthenes, 14-phenyl-14H-dibenzo[a,j]xanthene and tetrahydrobenzoxanthene-11-ones under solvent-free conditions using sulfated polyborate as a

Solvent-free Synthesis of 1,8-Dioxo-octahydroxanthenes and Tetra-hydrobenzo[a]xanthene-11-ones over Poly(N,N′-dibromo-N-ethylnaphtyl-2,7-sulfonamide)

In this work, poly(N,N′-dibromo-N-ethylnaphtyl-2,7-sulfonamide) (PDNES) as a highly efficient catalyst was applied for the synthesis of 1,8-dioxo-octahydroxanthenes and tetra-hydrobenzo[a]xanthene-11-ones under neutral and solvent-free conditions.

Ruthenium anchored on multi-walled carbon nanotubes: an efficient and reusable catalyst for the synthesis of xanthenes

A novel and highly efficient ruthenium-based catalyst was synthesized by immobilizing Ru(CO)4 onto functionalized multi-walled carbon nanotubes. The catalyst was characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray analysis, diffuse reflectance UV–Vis spectrophotometry, inductively coupled plasma and elemental analysis. This heterogeneous catalyst was successfully applied in the multi-component synthesis of various xanthene derivatives in good to excellent yields (28 samples, up to 96?% yield) under reflux condition and ultrasonic irradiation. The prepared catalyst was recovered four times without appreciable loss of activity.