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Now showing items 4480-4499 of 9669
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Synthesis of silica nanocubes by sol-gel method.
(orgz, 1999)This study investigated the effects of synthesis parameters such as water to alcohol (water/alcohol) ratios, types of alcohol and catalysts towards morphological properties of silica xerogels which were prepared according ... -
Synthesis of Some Ethyl 3-(Aryldiazenyl)-7-oxo-dihydropyrido [2, 3-f] quinoxaline-8-carboxylates
(Verlag der Zeitschrift für Naturforschung, 2007)Ethyl 7, 8-diamino-1-cyclopropyl-6-fluoro-4-oxo-1, 4-dihydroquinoline-3-carboxylate (6) and its free acid 7 are prepared by chemical reduction of the respective 7-azido-8-nitroquinoline 5. Consecutive nucleophilic addition ... -
Synthesis of some imines and investigation of their biological activity
(Hindawi, 2009)Some N-benzylidene aniline derivatives have been synthesized and tested as antibacterial agents. The results of the in vitro tests showed that most of the synthesized compounds were antibacterial inactive against E.coli. -
SYNTHESIS OF SOME NEW DERIVATIVES OF 1, 3, 4, 5-TETRASUBSTITUTED-1H-1, 2, 4-TRIAZOLES BY REACTION OF NITRILIMINES WITH ALDEHYDE METHOXYCARBONYIHYDRAZONES
(2016)Nitrilimines(2a-e) react with aldehyde methoxycarbonylhydrazones (3-5) to afford 3-acetyl-5-alkyl-1-aryl-4-(methoxycarbonylamino)-4, 5-dihydro-1H-1, 2, 4-triazoles (6-8a-e). The structure of these compounds was elucidated ... -
SYNTHESIS OF SOME NEW DERIVATIVES OF 1,3,4,5- TETRASUBSTITUTED-1H-1,2,4-TRIAZOLES BY REACTION OF NITRILIMINES WITH ALDEHYDE METHOXYCARBONYIHYDRAZONES
(الجامعة الإسلامية - غزة, 2006)Nitrilimines (2a-e) react with aldehyde methoxycarbonylhydrazones (3-5) to afford 3-acetyl-5-alkyl-1-aryl-4- (methoxycarbonylamino)-4,5-dihydro-1H-1,2,4-triazoles (6-8a-e). The structure of these compounds was elucidated ... -
SYNTHESIS OF SOME NEW SUBSTITUTED
(الجامعة الإسلامية - غزة, 2005)Nitrilimines (4a-c), react with 2-aminopyrazine (5), and its 2-carboxylic acid derivative (6) by cyclocondensation, yielding the corresponding imidazo[1,2-a]pyrazines (7 and 8), respectively. The assignment of structures ... -
Synthesis of Some New Substituted Imidazo (1, 2-a) Pyridines and Their 2-One Derivatives
(2016)2, 3-diaminopyridine (11)(a tri-nitrogen nucleophile) undergoes regioselective cyclocondensation reaction with nitrilimines (2, 10) affording 8-aminoimidazo [1, 2-a] pyridines (12) and 8-aminoimidazo [1, 2-a] pyridine-2-ones ... -
Synthesis of some new substituted imidazo [1, 2-a] pyrazines
(2005)Nitrilimines (4a-c), react with 2-aminopyrazine (5), and its 2-carboxylic acid derivative (6) by cyclocondensation, yielding the corresponding imidazo [1, 2-a] pyrazines (7 and 8), respectively. The assignment of structures ... -
SYNTHESIS OF SOME NEW SUBSTITUTED IMIDAZO(1,2-a)PYRIDINES AND THEIR 2-ONE DERIVATIVES
(الجامعة الإسلامية - غزة, 2006)2,3-diaminopyridine (11) (a tri-nitrogen nucleophile) undergoes regioselective cyclocondensation reaction with nitrilimines (2,10) affording 8-aminoimidazo[1,2-a]pyridines (12) and 8-aminoimidazo[1,2- a]pyridine-2- ones ... -
Synthesis of substituted 1, 2, 4-triazoles from reaction of nitrilimines with substituted hydrazones
(2004)Hydrazonoyl halides (1) react with substituted hydrazones of alkanone, cycloalkanone and heterocyclic ketones (2-4) to give the cycloaddition products 4, 5-dihydro-1, 2, 4-triazoles (5-7). The assignment of structures (5-7) ... -
Synthesis of Zinc Oxide nanoparticles at different aging time for low cost Dye Sensitized Solar Cells
(2018-02-15)Zinc oxide nanoparticles synthesized via simple precipitation method and aged at different time were used as photoanodes of dye sensitized solar cells (DSSCs). The structural and the optical properties of the obtained ... -
Synthesis towards new chiral dendrimers
(University of Manchester, 2004) -
Synthesis, characterization and applications of immobilized iminodiacetic acid-modified silica
(Kluwer Academic Publishers, 2003)Porous immobilized iminodiacetic acid modified silica of the general formula S—(CH2)3—N(CH2COOH)2, (where S represents [Si—O] n siloxane network) has been prepared by replacement of the iodide in 3-iodopropyl modified ... -
Synthesis, characterization and applications of polysiloxane networks with immobilized pyrogallol ligands
(John Wiley & Sons, Ltd., 2005)A porous, solid insoluble polysiloxane‐immobilized ligand system bearing pyrogallol active sites of the general formula P(CH2)3NH(CH2)3OC6H3(OH)2 (where P represents [SiO]n siloxane network) has been prepared by the ... -
Synthesis, characterization, and metal uptake of multiple functionalized immobilized-polysiloxane diamine-thiol chelating ligand derivatives
(Springer Berlin Heidelberg, 2018)Immobilized-polysiloxane (diamine-thiol) tetraethylacetate, P-(NN-S)-TEA (where P represents [Si–O] n polysiloxane network), was synthesized using one-pot reaction of tetraethylorthosilicate (TEOS) with 3-(ethylenediamin ... -
Synthesis, Crystallographic Characterization and Density Functional Study of Novel Spoke-Molecular Tetravent ethyltriphenylphosphorous Dibromide
(Chemical Science Transactions, 2016)A novel molecular tetravent ethyltriphenylphosphorous dibromide ((C6H5) 3PCH2Br2) has been synthesized in toluene and has been characterized by single crystal x-ray crystallography. Theoretical studies have been conducted ... -
Synthesis, spectral characteristics and structure of 1, 3‐and 1, 4‐disubstituted tetrazolinones
(WILEY‐VCH Verlag GmbH, 1995)Reaction of ethylene oxide with 1‐alkyl‐ or 1‐aryl‐1,4‐dihydrotetrazole‐5‐thiones in acetic acid affords the corresponding mesoionic 1‐alkyl‐ or 1‐aryl‐3‐(2‐hydroxyethyl)‐tetrazolium‐5‐olates 4–6. The X‐ray structure of ... -
Synthesis, structural characterization, and computational study of (E)-N′-(3,4-dimethoxybenzylidene)furan-2-carbohydrazide
(ELSEVIER, 2020-01)An efficient synthesis of the new (E)-N0 -(3,4-dimethoxybenzylidene)furan-2-carbohydra zide is described. Its molecular structural features have been characterized by FTIR, 1 H NMR, 13C NMR and MS, then have been confirmed ... -
Synthetize and Magnetic Properties of Al Substituted Ni Spinel Ferrites Prepared by Conventional Method
(الجامعة الإسلامية - غزة, 2017)The mixed polycrystalline ferrites, where x is the percentage increments of Al content, were prepared using the standard double sintering by mixing pure metal oxides , and . The magnetization ( M) was studied ... -
Synthetize and Magnetic Properties of Ni Substituted Polycrystalline Zn-spinel Ferrites
(2016-12)The mixed polycrystalline Ni1-sZnsFe2O4 ferrites where s is the percentage increments of Zn ions, were prepared using the standard double sintering by mixing pure metal oxides NiO, ZnO and Fe2O3. The netmagnetization ...