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Volume 2, No. 1, June 2007, Jamad 1 1428 H

Articles

 

 

Ring Inversion in Two Sterically Hindered (Z,Z)-Cycloocta-1,3-dienes

The 1H and 13C NMR spectra of 3,4-dibenzoyl-5-(benzylamino)-7,7-dimethylcycloocta-2,4-diene-1-one and dimethyl 3-(benzylamino)-5,5-dimethyl-7-oxocycloocta-2,8-diene-1,2-dicarboxylate, at room temperature, are consistent with slow ring inversion. The crystal structure of 3,4-dibenzoyl-5-(benzylamino)-7,7-dimethylcycloocta-2,4-diene-1-one (C31H29NO3) belongs to P21(1)/n space group .

 

 

Issa Yavari*, Mehdi Sirouspour, Sanaz Souri, Farough Nasiri and Hoorieh Djahaniani

JJC, 2007, 2(1), 1-10

Synthesis and Biological Activity of Some New
5-Sulphanyl- 4-nitroimidazole Derivatives

Some 5-sulphanyl derivatives of 1-Benzyl-2-alkyl-4-nitro-1H-imidazoles derivatives were prepared and characterized. The biologically tested derivatives were nonmutagenic and have moderate to good antibacterial activity, some of them showed a potent antimutagenic effect.

 

Hasan Tashtoush*, Yaseen Al-Soud, Ahmed Maslat, Mohanad Shkoor and Mahmoud Al-Talib

JJC, 2007, 2(1), 11-20

Study of the Conformational Dependence of 13C Chemical Shifts of Cycloalkanes using Regression Analysis Method

The effect of spatial arrangement on carbon-13 (13C) chemical shifts can't be determined quantitatively by the regular experimental techniques. Semi-empirical and statistical methods could be used effectively for such calculations. Additive parameters are suggested for the calculation the 13C chemical shifts of cyclohexanes, cis- and trans-decalin, and for structural isomers of perhydrophenanthrene (PHP) and perhydroanthracene (PHA).

 

 

Emad A.S. Al-Hyali* and Faiz M.A. Al-Abady

JJC, 2007, 2(1), 21-44

Uptake of Some Divalent Metal Ions on Layered
α-VOPO4.2.5H2O and Its 1,10-Phenanthroline, 2,2
¢-Bipyridyl
and 4,4
¢-Bipyridyl Intercalated Products

layered α-vanadyl phosphate, VOPO4.2.5.H2O, shows a tendency to intercalate 1,10-phenanthroline, 2,2`-bipyridyl and 4,4`-bipyridyl. Correlation between thermal analysis and chemical analysis of the resulted products shows that the thermal analysis can be considered as a good tool for their formulation. The uptake of the divalent metal ions Co2+,Ni2+,Cu2+, Zn2+, Cd2+ and Pb2+ on alpha vanadyl phosphate and its intercalated products shows selectivity toward Pb2+ ions and that found to be dependent on the pH and the nature of the organic ligand.

 

 

Sadek K. Shakshooki *, Ramadan M. El-Mahdwi, Mohamed.T. Mehabis, Mahmoud A. Elrais, Salwa.O. Etter and Ragiab A.Mokhtar

JJC, 2007, 2(1), 45-52

Selective Hydrogenation of Cinnamaldehyde over
Salt-Promoted Pd-Based Catalysts

The effect of salt additives (AlCl3, SnCl2, FeCl3) on the catalytic behavior of Pd3%/Al2O3 catalyst in the selective hydrogenation of cinnamaldehyde in i-propanol was studied. The selectivity towards cinnamyl alcohol formation could be raised up to 70% by introducing small concentrations of these salts.

 

 

 

Ayman Y. Hammoudeh*, Shireen M. Sa’ada and Sabri S. Mahmoud

JJC, 2007, 2(1), 53-67

Bromination of Ketones by Palladium(II). An Asymmetric a-Bromoketones Catalytically Synthesized by a Mono Palladium(II) Catalyst

The oxidation of ketones (1) by monometallic [Pd(CH3CN)2(S)-Tol-BINAP](BF4)2 A or [Pd(CH3CN)2(S)-METBOX](BF4)2 B in aqueous THF containing copper(II) bromide produced chiral a-bromoketones (2).  The a-bromoketone products were obtained with moderate to high enantiomeric excess (68-89% ee) and good isolated yields (70-90%).  The highest optical purities were 89% ee for cycloheptanone.  Catalyst B gave slightly higher enantioselectivities than catalyst A.

 

 

Arab K. El-Qisairi* and Hanan A. Qaseer

JJC, 2007, 2(1), 69-78

A Novel Al3+-Selective Potentiometric Sensor Based on 3,4,13,14-Tetraphenyl-2,5,12,15-Tetraazatricyclo[11,0,0611]cosa;1(16),2,4,7,9, 6(11),12,14,17,19-Decaene in a PVC Matrix and its Application in Analyzing Biological Fluids

A novel PVC membrane electrode for Al3+ ion based on 3,4,13,14-tetraphenyl-2,5,12,15-tetraazatricyclo[11,0,0611]cosa;1(16),2,4,7,9,6(11),12,14,17,19-decaene as a suitable ionophore was prepared. The electrode exhibits a Nernstian response for Al3+ ion over a wide concentration range (4.0 x 10–8 to 1.0 x 10–1 M) with a slope of 19.58 ± 0.3 mV/decade. The limit of detection is 2.0 x 10–8 M. The electrode has a response time of 10 s and a useful working pH range of 3-11. The proposed membrane sensor successfully used in the determination of aluminum ion in biological fluids and as an indicator electrode.

 

 

 

Sulekh Chandra*, Chandan Kumar Singh and Himanshu Agarwal

JJC, 2007, 2(1), 79-88

Co-adsorption of Formic Acid and Potassium on Cu{100}:
A Temperature Programmed Desorption Study

For the first time, formic acid and potassium co-adsorption on Cu{100} surface is studied by temperature desorption spectroscopy following the mass 39 signal, interestingly providing a different adsorption-desorption behaviour compared to the K/Cu{100} system.

 

Ehab AlShamaileh* and Aiman E.
Al-Rawajfeh

JJC, 2007, 2(1), 89-95

 

Elimination of Organic Pollutants using Supported Catalysts   with Hydrogen Peroxide

Picric acid (2, 4, 6, tri-nitro-phenol) was studied as a water pollutant. Different supported catalysts were tested in the presence of hydrogen peroxide as a method for elimination of the organic pollutant from waste water. Cobalt (II) nitrate immobilized in silica gel was selected for detailed study. The effect of pH, initial concentration of hydrogen peroxide, amount of catalyst, and temperature were studied to find the optimum conditions for the wet oxidation of this organic pollutant. Experimental kinetic study was conducted using visible spectrophotometric techniques and chemical oxygen demand (COD). Supported catalysts demonstrated experimentally some reusability.

 

Khaled El-sousy, Ahmed Hussen, Khaled Hartani and Hisham El–Aila*

JJC, 2007, 2(1), 97-103