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Volume 3, No. 3, September 2008, Ramadan 1429 H

Articles

 

 

Synthesis of New 4-Substituted-3-alkoxy-2-butenoic Acid Esters and Pyrazole-3- one Derivatives

A number of new 4-substituted-3-alkoxy-2-butenoic acid esters have been synthesized through the reaction of ethyl (2E)-4-bromo-3-alkoxybut-2-enoates with phenols or naphthols in the presence of potassium carbonate and acetone. Treatment of these esters with hydrazine hydrate in ethanol afforded new pyrazol-3-one derivatives.

 

Aymen S. Abu Hatab, Mikdad T. Ayoub, Mohammad S. Mubarak*

JJC, 2008, 3(3), 211-221

Synthesis and Biological Evaluation of Some New
Thienopyridine and Thienopyrimidine Derivatives

Reactions of 3-amino-2-(4-bromobenzoyl)-4-cyano-5-phenyl-aminothiophene (3a) or 2-acetyl-3-amino-4-cyano-5-phenylamino-thiophene (3b) with a variety of active methylene compounds, such as ethyl cyanoacetate, ethyl acetoacetate, ethyl benzoylacetate and diethyl malonate, yielded the corresponding thieno[3,2-b]pyridine-2-one derivatives (4a,b-7a,b). Also the reaction of (3a) or (3b) with formamide and formic acid, afforded the corresponding thieno[3,2-d]pyrimidine derivatives (8a,b) while the reaction of compound (3a) with phenyl isothiocyanate, yielded thieno[3,2-b]pyrimidin-2-thione derivative (9).

 

Ahmed M. M. El-Saghier*, Fathy S. Matough, Mahmoud F. Farhat, Nabil A. Saleh, Khaled M. Kreddan, Somaia O. El-Tier, Hind Bin Hussien

JJC, 2008, 3(3), 223-232

Antimicrobial Activity of Some New Oxadiazole Derivatives

Alkyl, alkenyl, sulfonyl, thiocarbamates and Mannich derivatives were synthesized and tested for antimicrobial activity. The thiocarbamates derivatives were the most potent compounds.

R1= Phenyl, Pyridyl

R2= Alkyl, Alkenyl, Alkyne, Thiocarbamate Mannich derivative.

X= S

R1= Phenyl, Pyridyl

R2= Alkyl, Phenylethyl.

X= SO2

 

 

Zuhair Muhi-eldeen*, Ghada Juma’a, Elham Al-kaissi, Lina Nouri

JJC, 2008, 3(3), 233-243

Synthesis  of  Bis(Phenoxyimine)Zirconium  Dichloride  Complexes  Containing  Bromo,  Iodo,  or  Alkynyl  Substituted  Phenoxyimine  Ligands  as  Catalyst  Precursors  for  the  Polymerization  of  Ethylene

A series of 23 bis(phenoxyimine)zirconium dichloride complexes with halogen or alkynyl  functionalized ligand frameworks was synthesized and characterized. After activation  with  methylalumoxane (MAO), these catalysts polymerize ethylene. 

 

 

Christian  Görl,  Helmut G. Alt*

JJC, 2008, 3(3), 245-267

Structures of H2 layers on LiF(001)

Perturbation theory calculations of the rotational motion of a hydrogen molecule rotates at the center of a p-type unit cell are reported. These calculations show that the molecular axis of H2 is azimuthally delocalized and hence it can be tunneled into classical forbidden region where the structures are indeed “c” type rather than “p” type. Thus estimating the quantum effects of those species will change the monolayer configurations into c-type structures and hence match the recently reported Helium Atom Scattering (HAS) results.

 

 

Jamal Dawoud*, Abdulwahab Sallabi, Ismail Fasfous, David Jack

JJC, 2008, 3(3), 269-279

Physical Vapor Deposition of Nanocrystalline Composites of Ag-Ni for Electrical Contacts in Automotive Industries

X-ray diffraction results of the Ag49Ni51 and Ag81Ni19 films are shown in together with that of a pure Ag and a pure Ni film. The two broad diffraction peaks in the diffraction pattern from Ag49Ni51, one at a slightly higher angle than that of Ag(l11) and the other at a slightly lower angle than that of Ni(l11) peak, suggest that the film consists of a Ag-rich phase and a Ni-rich phase rather than a single, face-centered-cubic (fcc) solid solution.

 

 

Shehdeh Jodeh*

JJC, 2008, 3(3), 281-292

Effect of Chemical Treatment of Multi-Walled Carbon
Nanotubes with Various Oxidizing Agents on its
Preconcentration Performance of Some Metals

Multi-walled carbon nanotube was oxidized with various oxidizing agents (nitric acid, hydrogen peroxide and ammonium persulphate) to produce multi-walled carbon nanotubes of various surface properties. The oxidized sorbents were used for preconcentration of some metals (Mn2+, Pb2+, Cu2+, Cd2+, Zn2+) from environmental waters prior to their determination by flame atomic absorption spectroscopy.

 

 

Amjad H. El-Sheikh*

JJC, 2008, 3(3), 293-304

The Determination of Ultra-trace Amounts of
N,N-Diethylhydroxylamine Residues in Water Used
for High-Pressure, High-Temperature Steam Turbines

A developed Method for the determination of diethylhydroxylamine in water samples is reported. The method is highly selective, sensitive, and rapid and gives a good reproducibility for the determination of ultra-trace amounts of diethylhydroxylamine residues in boiler water after use of the diethylhydroxylamine as an oxygen scavenger. It allows the diethylhydroxylamine concentrations in water samples to be determined over the ranges 36-460ppb and 178-2140ppb, with a relative standard deviation of less than 1%.  The method is based on the inhibition of the bleaching of Remazol Brilliant Blue by oxidation with chloramine-T.

 

 

R. A. Mokhtar*, F. Z. Shtewi,  A. Al-Zawik, S. Karsheman

JJC, 2008, 3(3), 305-319

 

Determination of Commercial Colorants in Different Water Bodies Using Partial Least Squares Regression (PLS): A Chemometric Study

Partial Least Squares Regression (PLS-1) is for the simultaneous determination of Basic Blue 9, Brilliant Blue E-4BA, and Reactive Blue 2 in wastewater without the need for expensive chromatographic separation. At the best modeling conditions, mean recoveries and relative standard deviations (R.S.D.) for dyes determination vis PLS-1 were found to be 101.3 (4.5%), 95.7 (8.4%), and 94.9 (6.4%) for Basic Blue 9, Brilliant Blue E-4BA, and Reactive Blue 2, respectively.

Basic Blue 9

 

 

Yahya S. Al-Degs*, Amjad H.
El-Sheikha, Mohammad A. Al-Ghouti,
Mahmoud S. Sunjuk

JJC, 2008, 3(3), 321-336