2020-03

Science Journal of University of Zakho (القضية : 1) (الحجم : 8)

Series of new Schiff bases and their derivatives (Oxazepine) have been synthesized during two steps. The first step synthesis of imines derivatives (1-10) by the condensation reaction of 1, 7-diaminohepatane and 1, 8-diaminooctane with different substituted aromatic aldehydes by using glacial acetic acid as catalyst. The second step includes reaction of the prepared Schiff bases derivatives with phathalic anhydride in dry benzene to obtain seven-membered heterocyclic ring derivatives (11-15). The biological activities of some prepared compounds were also studied against different kinds of bacteria. The new derivatives were confirmed by suing a range of experimental techniques including 1 HNMR, 13 C NMR, IR and Mass spectra.

2019-09

Research Journal of Chemistry and Environment (القضية : 9) (الحجم : 23)

New Schiff base compounds have been prepared. Various aliphatic and aromatic ketones were condensed with naphthalene-1, 5-diamine to yield the desired Schiff bases. The structures of all the new products obtained in the present work are supported by spectral and analytical data (IR, NMR and Mass spectroscopy). Furthermore, the biological activity of Schiff Bases compounds was tested against two types of bacteria gram positive for the dye (Staphylococcus aureus) and gram-negative dye (E.Coli).

2017-03

Liquid Crystals (القضية : 1) (الحجم : 44)

One of the current challenges in liquid crystal science is to understand the molecular factors leading to the formation of the intriguing twist-bend nematic phase (NTB) and determine its properties. During our earlier hunt for the NTB phase created on cooling directly from the isotropic phase and not the nematic phase, we had prepared 30 symmetric liquid crystal dimers. These had odd spacers and methylene links to the two mesogenic groups; desirable but clearly not essential features for the formation of the NTB. Here, we report the phases that the dimers exhibit and their transition temperatures as functions of both the lengths of the spacer and the terminal chains. In addition we describe the transitional entropies, their optical textures, the X-ray scattering patterns and the 2H NMR spectra employed in characterising the phases. All of which may lead to important properties of the twist-bend nematic phase.

2013-06

Journal of Education and Science (القضية : 2) (الحجم : 26)

A seriers of 1, 3, 4-oxadiazol-2-thion were synthesized by the reaction of naproxen (or acetyl) amino acid hydrazides (glycine, valine, leucine, isoleucine and tyrosine) with carbon disulphide in alkaline medium. The reaction of naproxen (or acetyl) amino acid hydrazides were treated with p-chloro benzaldehyde to give hydrazone, the hydrazones were then cyclized with lead dioxide to give 1, 3, 4-oxadiazol-2-aryl. Naproxen amino acid esters were treated with ammonia gas to give naproxen amino acid amids. The synthesized compounds were characterized by physical and spectral analysis.

2010-09

Journal of Dohuk University (pure and engineering sciences) (القضية : 1) (الحجم : 13)

Partially dehydrated commercial barium hydroxide have been used to catalyze Michael reaction of 1-(4-pyridyl)-3-(2-furfuryl or 4-chloro Phenyl)-2-propene-1-one(1a,d) with compounds containing methylene group activated by two carbonyl groups like acetyl acetone, and methyl (or ethyl) acetoacetate. The product obtained depends on the temperature of the reaction. Room temperature reactions afforded cyclohexanone derivatives (3a-f), where, reactions in high temperature gave cyclohexanone derivatives (4a-f)

2009-01

Journal of Chemistry (القضية : 1) (الحجم : 6)

In this study, pine fruit was used as solid adsorbent for removal of ferrous and copper ions from aqueous solutions through batch equilibrium technique. The influence of contact time, pH of the solution and initial concentration of metal ions on adsorbed amount of metal ions were investigated. 90 minutes of adsorption time was found sufficient to reach equilibrium for ferrous ion and 120 minutes for copper ion. Adsorption of metal ions were pH dependent and the results indicate the optimum pH for the removal of Fe+2 was found to be 5.0 and that of Cu+2 was 7.0, the highest adsorption capacity was found to be 4.8 and 14.1 mg of metal ion per gram of adsorbent at initial concentration of 22.22 mg/L and 57.6 mg/L of ferrous and copper ions respectively and would be higher with higher initial concentration. Ferrous ion was removed by 96.3 - 97.3% and copper ion by 94.1-96% along the whole range of initial concentrations. Isotherm studies showed that the data were best fitted to the Freundlich isotherm model. The kinetic data corresponded well with the pseudo-second order equation, suggesting that the adsorption process is presumably a chemisorption.

2006-01

Tikrit Journal of Pure Science (القضية : 1) (الحجم : 11)

New method for synthesis of new methyl malonamic acid derivatives have been employed successfully via the nucleophilic substitution reactions of methyl malonyl chloride with urethane followed by the reaction with some of nucleophilic reagents (amine, alcohol and water) in the same medium and reaction vessel. The structural formulas of the synthesized compounds were elucidated by physical and spectroscopic methods.

2004-09

Journal of Education and Science (القضية : 2) (الحجم : 15)

New derivatives of acetylenic amine of isatin were synthesized through Mannich reaction which involved reaction of N-propargyl isatin with paraformaldehyde and secondary amines. These compounds showed biological activity as antibacterial agents. The structures of the synthesized compounds have been elucidated by physical and spectroscopic methods.

2004-01

Rafidain Journal of Science (القضية : 1) (الحجم : 15)

Saccharin has been used to synthesize new derivatives of acetylenic amines through Mannich reaction which involved the reaction of N-propargyl saccharin with paraformaldehyde and secondary amines. The structures of these compounds were confirmed by physical and spectroscopic methods. Some of the synthesized compounds showed biological activity as antibacterial agents.