60027-78-3Relevant academic research and scientific papers
Nanocomposite-based inorganic-organocatalyst Cu(II) complex and SiO2- and Fe3O4 nanoparticles as low-cost and efficient catalysts for aniline and 2-aminopyridine oxidation
Adam, Mohamed Shaker S.,Al-Omair, Mohammed A.
, (2020/09/09)
Bis-imino Cu(II) complex (CuLAn2), in which the imine ligand (HLAn) acts as a bidentate chelating ligand, was synthesized. The catalytic potential of the inorganic-organocatalyst was studied homogeneously and heterogeneously in the oxidation of aniline and 2-aminopyridine by H2O2 or tBuOOH. Two heterogeneous inorganic-organocatalysts, CuLAn2@Fe3O4 and CuLAn2@SiO2@Fe3O4, were synthesized by the successful immobilization of CuLAn2 on the Fe3O4 surface and the composited Fe3O4 with SiO2, respectively. The heterogeneous structure of those inorganic-organocatalysts was confirmed using Fourier-transform infrared, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy, and magnetic properties. The adsorption–desorption isotherms revealed respectable adsorption parameters (SBET, Vp, and rp). All catalysts exhibited high potential in the oxidation of aniline (with phenylhydroxylamine as the main product) and good potential in the oxidation of 2-aminopyridine, in the first attempt (with 2-nitropyridine-N-oxide and 2-nitrosopyridine-N-oxide as main products), at room temperature. Acetonitrile was found to be the best solvent compared to ethanol, dimethyl sulfoxide, chloroform, and water. The homogeneous catalyst exhibited reusability for three times. The heterogeneous catalysts, CuLAn2@Fe3O4 and CuLAn2@SiO2@Fe3O4, were active for five and seven times, respectively. A mechanism was proposed within electron and oxygen transfer processes.
Synthesis, antioxidant and antibacterial activities of some Schiff bases containing hydroxyl and methoxy groups
Al-Mamary, Mohammed,Abdelwahab, Siddig Ibrahim,Ali, Hapipah Mohd,Ismail, Salma,Abdulla, Mahmood Ameen,Darvish, Pouya
experimental part, p. 4335 - 4339 (2012/09/07)
A series of Schiff bases were synthesized from different aromatic amines and aromatic aldehydes containing hydroxyl and methoxy groups. These compounds were characterized by IR and 1H NMR. All the compounds were screened for in vitro antioxidant activity using DPPH method and total reducing power activity based on the ability of compounds to reduce the Fe3+-TPTZ complex to the Fe2+/ferrous. Compounds substituted with hydroxyl and other electron donating groups, such as, methoxy groups showed low to high antioxidant activity. In addition, the compounds have been screened for their antibacterial activity against strains of Escherichia coli, Methycillinresistant Staphylococcus aureus, Klebsiella pneumonia and Pseudomonas aeruginosa. The tested Schiff bases at 5 mg/disc showed different antibacterial activities depending on the type of the tested bacterial species. However, E. coli appeared to be sensitive to seven compounds (Ia, Ib, Ic, Id, If, IIb and IIe), while methicillin resistant Staphylococcus aureus (MRSA) was affected by Ic, Ie, IIc and IIe compound. On the other hand, the compounds Ia, Ic, Id, Ie and IIh revealed antibacterial activity against Klebsiella spp. The Pseudomonas aeruginosa was not sensitive to any of the tested Schiff bases.
Synthesis, characterization and use of Schiff bases as fluorimetric analytical reagents (part II)
Ibrahim, Mohamed N.,Sharif, Salaheddin A. I.
experimental part, p. 180 - 184 (2012/02/02)
Many Schiff bases were prepared by condensation reaction of certain aromatic amines with aromatic aldehydes derivatives and then the fluorescence properties of these Schiff bases were examined in acidic and basic media. It is shown that these compounds can be used for fluorimetric monitoring of small pH changes.
Synthesis and antibacterial activities of some schiff bases
Ibrahim, Mohamed N.,Sharif, Salaheddin A. I.,El-Tajory, Ahmad N.,Elamari, Asma A.
experimental part, p. 212 - 216 (2012/02/04)
Schiff bases p-hydroxybenzylidene-2-carboxyaniline, p-nitrobenzylidene-2- carboxyaniline, p-(N, N-dimethyl)aminobenzylidene-2-carboxyaniline, N-(4-hydroxybezylidene)-benzene-1,2-diamine, N-(4-nitrobezylidene)benzene-1,2- diamine,N-(4-(N, N-dimethylaminobezylidene)benzene-1,2-diamine, N-(4-(N,Ndimethylamino) benzylidene)naphthalen-1-amine,N-(4-nitrobenzylidene) naphthalen-1-amine,N-(4-chlorobenzylidene)naphthalen-1-amine,sodium-4-(4-(N, N-dimethyl amino)benzylideneamino)naphthalene-1-sulfonate,sodium -4-(4-nitrobenzylideneamino) naphthalene-1-sulfonate and sodium-4-(4- chlorobenzylideneamino) naphthalene-1-sulfonate obtained by condensation of aniline and naphthylamine derivatives with some aromatic aldehydes were characterized by physical and spectral methods. The biological activity of these products were as antibacterial agents against three species of human pathogenic bacteria such as Escherichia coli, Staphylococcus aureus and Klebsiella sp. Nearly 50% of these compounds showed reasonable activity against the bacterial species investigated and we found that the antibacterial activity is dependent on the molecular structure of the compounds.
Synthesis of 2-(o-Arylideneaminophenyl)-3-(5-alkyl-1,3,4-thiadiazol-2-yl)quinazolin-4-ones as Potential Anthelmintic Agents
Shukla, J. S.,Singh, Mithilesh,Rastogi, Renu
, p. 306 - 307 (2007/10/02)
A series of 2-(o-arylideneaminophenyl)-3-(5-alkyl-1,3,4-thiadiazol-2-yl)quinazolin-4-ones (13-41) have been synthesised and screened for their cestodicidal activity against Hymenolepis nana infection in rats.Compound 19 has been found to be the most active member of the series showing 77.2percent clearance of infection at a dose of 250 mg/kg given for 3 days.
The Role of Carboxyl Group of Anthranilic Acid on the Spectral Properties of its Schiff Bases and Acidity Constants of these Bases
Mahmoud, M.R.,El-Samahy, A.A.,El-Gyar, S.A.
, p. 424 - 428 (2007/10/02)
The role of the carboxyl group of anthranilic acid on the spectral properties of its Schiff bases with aromatic aldehydes is elucidated.Band assignment for the different absorption bands observed in the spectra of these Schiff bases is made in the light of solvent polarity, molecular structure and spectral shifts observed in buffer solutions of varying pH's.Furthermore the possible pK values of these Schiff bases were determined and discussed in terms of molecular structure.
