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Antar Ahmed Abdelhamid

Assistant Professor - استاذ مساعد

Faculty of science

Address: Dr.

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Hydrothermal preparation and characterization of ZnFe2O4 magnetic nanoparticles as an efficient heterogeneous catalyst for the synthesis of multi‐substituted imidazoles and study of their anti‐inflammatory activity

2018 | Keywords ZnFe2O4 nanoparticles, non‐chromatographic method, superparamagnetic materials, Multicomponent reaction, multicomponent rea, imidazoles, efficient catalyst , efficient, biologically active,
Hydrothermal preparation and characterization of ZnFe2O4 magnetic nanoparticles as an efficient heterogeneous catalyst for the synthesis of multi‐substituted imidazoles and study of their anti‐inflammatory activity
Nanoparticles are key focus of research for a wide range of novel applications. As such, ZnFe2O4 magnetic nanoparticles were synthesized hydrothermally and charac-terized via scanning and transmission electron microscopies, powder X‐ray diffrac-tion, energy‐dispersive X‐ray and infrared spectroscopies, thermogravimetric analysis and magnetic measurements. They were used as a robust catalyst for the synthesis of a series of biologically active multi‐substituted imidazoles ... Read more

New Method for Synthesis of Multi-substituted Imidazoles

2018 | Keywords Multi-substituted Imidazoles, Synthesis, alkylation, one-pot Multicomponent synthes,
New Method for Synthesis of Multi-substituted Imidazoles
Here, we reported two methods for the synthesis of multi-substituted imidazoles,firstly via four-component cyclocondensation reaction of benzil, aliphatic amines (allylamine or pentylamine), and aromatic aldehyde and ammonium acetate. Using an ionic liquid catalyst namely, diethyl ammonium hydrogen sul-fate, and under solvent-free conditions. Secondly, via the alkylation of synthesized NH imidazoles with alkyl halide (allyl bromide and pentyl bromide) gave8a–cin high ... Read more

An Efficient One-Pot Three-Component Synthesis of Some New Polyhydroquinolines via Enaminone Intermediates

2017 | Keywords One-Pot Three-Component, New Polyhydroquinolines, Enaminone Intermediates,
An Efficient One-Pot Three-Component Synthesis of Some New Polyhydroquinolines via Enaminone Intermediates
For a wide spectrum of pharmacological effects of polyhydroquinolines, this study introduces a developed safe, simple, higher yields and fast method for the synthesis of some new hexahydroquinoline derivatives using one-pot three-component cyclocondensation reaction, via the reaction of 1,3-cyclohexanedione with primary amine and arylidinemalononitrile or salicylaldehyde derivatives. The prepared compounds were reacted with different reagents asN,N-dimethylformamide dimethylacetal, acetic anhydride, sulphuric ... Read more

Novel Quaternary Ammonium-Based Cationic Surfactants: Synthesis, Surface Activity and Evaluation as Corrosion Inhibitors for C1018 Carbon Steel in Acidic Chloride Solution

2017 | Keywords Cationic surfactants, Corrosion inhibition, Carbon steel, Cyclohexene, EIS, SEM, EDX,
Novel Quaternary Ammonium-Based Cationic Surfactants: Synthesis, Surface Activity and Evaluation as Corrosion Inhibitors for C1018 Carbon Steel in Acidic Chloride Solution
A novel class of quaternary ammonium-based cationic surfactants is synthesized and characterized via spectroscopic methods (FTIR, 1 HNMR and13 C NMR). The surface properties, foaming power and biodegrad-ability of the synthesized cationic surfactants are deter-mined using the surface tension technique. The protection performance with their adsorption mecha-nisms for carbon steel is evaluated in a 15% HCl solu-tion by a series ... Read more

Crystal structure of 1-[2-(4-nitrophenyl)-4,5-diphenyl-1H-imidazol-1-yl]propan-2-ol

2017 | Keywords crystal structure, Multi-substituted Imidazoles, hydrogen bonding., C—Hinter-actions,
Crystal structure of 1-[2-(4-nitrophenyl)-4,5-diphenyl-1H-imidazol-1-yl]propan-2-ol
The title compound, C24H21N3O3, crystallizes with two unique but closely r.m.s. overlay fit = 0.215 A˚) comparable molecules (1 and 2) in the asymmetric unit of the triclinic unit cell. In molecule 1, the dihedral angles between the central imidazlole ring and the benzene-ring substituents are 42.51 (9), 45.41 (9) and 56.92 (8), respectively. Comparable data for molecule 2 are ... Read more

Sol–gel Derived Mixed Oxide Zirconia: Titania Green Heterogeneous Catalysts and Their Performance in Acridine Derivatives Synthesis

2016 | Keywords ZrO2 TiO2, Sol gel, Basic catalyst, TEM, XRD, Acridine synthesis,
Sol–gel Derived Mixed Oxide Zirconia: Titania Green Heterogeneous Catalysts and Their Performance in Acridine Derivatives Synthesis
Various zirconia content in ZrO2–TiO2 mixed oxide catalysts (x=5, 10, 20 ZrO2wt%) were synthesized by cost-effective sol–gel process and characterized by different techniques, i.e. XRD diffraction patterns, TG– DTA analyses, FTIR spectroscopy, N2 adsorption/desorp-tion measurements, and TEM microscope. The investiga-tion of the acidic/basic properties was studied by means of FTIR spectroscopy using pyridine as an adsorbed mole-cule. Characterization estimates exhibit ... Read more

Morpholinium hydrogen sulfate (MHS) ionic liquid as an efficient catalyst for the synthesis of bio-active multi-substituted imidazoles (MSI) under solvent-free conditions

2016 | Keywords biological activity, efficient catalyst , four-component reaction, imidazoles, ionic liquid, non-chromatographic method,
Morpholinium hydrogen sulfate (MHS) ionic liquid as an efficient catalyst for the synthesis of bio-active multi-substituted imidazoles (MSI) under solvent-free conditions
Morpholinium hydrogen sulfate as an ionic liquid was employed as a catalyst for the synthesis of a biologically active series of multi-substituted imidazoles by a four-component reaction involving the combination of benzil with different aromatic aldehydes, ammonium acetate, and 1-amino-2-propanol under solvent-free con-ditions. The key advantages of this method are shorter reaction times, very high yield, and ease of processing. ... Read more

Crystal structure of 1-[2-(4-chlorophenyl)-4,5-diphenyl-1H-imidazol-1-yl]propan-2-ol

2016 | Keywords crystal structure, Multi-substituted Imidazoles, hydrogen bonding., C-H,
Crystal structure of 1-[2-(4-chlorophenyl)-4,5-diphenyl-1H-imidazol-1-yl]propan-2-ol
The title compound, C24H21ClN2O, crystallizes with two unique molecules in the asymmetric unit. In each molecule, the central imidazole ring is substituted at the 2-, 4- and 5-positions by benzene rings. The 2-substituted ring carries a Cl atom at the 4-position. One of the imidazole N atoms in each molecule has a propan-2-ol substituent. In the crystal, a series of ... Read more

Synthesis and Anti-inflammatory Study of Novel N-substituted Hydro-acridine-1,8-diones and Bis-hexahydroacridine-1,8-dione Derivatives

2015 | Keywords Acridines, Bis-acridine, Hexahydroacridinones, Anti-inflammatory agents,
Synthesis and Anti-inflammatory Study of Novel N-substituted Hydro-acridine-1,8-diones and Bis-hexahydroacridine-1,8-dione Derivatives
We report in this study the synthesis of some new N-substituted hexahydro- acridine-1,8-dione compounds including some new N- 2-hydroxypropylhexahydro- acridine-1,8-diones and their tosylatedoctahydro-acridine-1,8-dione derivatives in addition to some bis-hexahydroacridine-1,8-diones via a one pot reaction technique. Moreover,in vivo anti-inflammatory evaluation for some newly synthesized compounds has been investigated. The highly alkylated bis-hydroacridine-1,8-dione 5f showed a higher anti- inflammatory potency more than ... Read more

Multicomponent green synthesis, spectroscopic and structural investigation of multi-substituted imidazoles. Part 1

2015 | Keywords Brønsted acids, green chemistry, imidazoles, ionic liquid, molecular structures, multicomponent reactions,
Multicomponent green synthesis, spectroscopic and structural investigation of multi-substituted imidazoles. Part 1
Ten 1,2,4,5-tetra-substituted imidazole deriva-tives have been synthesized with a 2-hydroxyethy sub-stituent at the 1-nitrogen atom and potentially electron releasing hydroxy-, methoxy-, dimethylamino- or nitro substituents in various positions on the benzene ring located on the 2-carbon atom. The prototypical derivative with an unsubstituted phenyl ring at the 2-position is also reported. The compounds are obtained in excellent yields (average 86 ... Read more

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