JJC Information

Author Index

Reviewer Index

Editorial Index

 
     JJC » Issues
 
 
Home
Contact Address  
Download  
JJC Issues  
Subscriptions  
Feedback
 

Common Links

Leaflet In English
Leaflet In Arabic 
Contact Address 
Customer Service 
Technical Support

 

Volume 4, No. 3, September 2009, Shawwal 1430 H 

Articles

 

 

Synthesis and Biological Evaluation of New 1,4-Thiazine Containing Heterocyclic Compounds

4H-1,4-benzothiazines are prepared by condensation of 2-aminobenzenethiol with b-diketones / b-ketoesters in dimethyl sulfoxide. These prepared 4H-1,4-benzothiazines are used as base to prepare ribofuranosides by treating them with b-D-ribofuranosyl-1-acetate-2,3,5-tribenzoate. 4H-1,4-Benzothiazines, on refluxing with hydrogen peroxide in glacial acetic acid gave 4H-1,4-benzothiazine-1,1-dioxides (sulfones). Their antioxidant and antimicrobial activity have also been evaluated. Structure of the synthesized compounds have been established by their spectral investigation.

 

 

Shikha Gupta*, Neha Ajmera, Priyadarshi Meena, Naveen Gautam, Ashok Kumar,
D.C. Gautam

 JJC, 2009, 4(3), 209-221

Antioxidant Additives for Lubricating Oils. Synthesis and Evaluation of some Polyfunctionalized Phenols Linked to Heterocycles

The antioxidants activities of the polyfunctionalized Phenols Linked to heterocyclic derivatives, using the turbine base oil, were evaluated.

 

El Sayed H. EL Ashry*, Mohamed E. El-Rafi, Mohamed H. Elnagdi,
Hamdy H. Abou-Elnaga, Wedad M.A. Abdel Azim and Yasser M. Boghdadi

 JJC, 2009, 4(3), 221-231

Bimetallic Group 6 Tricarbonyls Containing Rigid Backbone Chelating Ligands Symmetrically Bridged by Bis(diphenylphosphino)alkane

Bimetallic group 6 carbonyls of the general formula fac-[(L)M(CO)3]2(μ-dppa) (M = Mo, W; L =  dppe, phen; dppa = dppe, dppb, dpph, dppo, dppd) have been prepared by the reaction of the labile complex fac-(L)M(CO)3(py) and the corresponding dppa as bridging ligand. These new complexes are highly stable as solids and in solution.

 

 

Khalil J. Asali*, Mohammad
El-khateeb, Ahmad Daraosheh

JJC, 2009, 4(3), 233-242

Solvo-Thermal Application for the Synthesis of
[Et4N][(
m-H)Mo2(CO)10] and its Bidentate Phosphine Derivatives and
the X-ray Structure of (
m-Ph2P(CH2)2PPh2) [Mo (CO)4(NCCH3)]2

The compounds [Et4N][(m-H)(m-Ph2P(CH2)nPPh2)Mo2(CO)8] (n = 1 and 2) and their parent compound [Et4N][(m-H)Mo2(CO)10] were synthesized using solvo-thermal method. The IR spectra are identical with those prepared by conventional methods. Protonation of [Et4N][(m-H)(m-Ph2P(CH2)nPPh2)Mo2(CO)8] using CF3CO2H at -70° in CH3CN led to the capture of the intermediate [(CO)4MoDPPEMo(CO)4], which was isolated as a solid material and identified by elemental analysis, FT-IR and X-ray structure as (m-Ph2P(CH2)2PPh2)[Mo(CO)4(NCCH3)]2. The X-ray analysis show the following parameters, P2/n (No. 14), Z=2, a = 11.957 (2) Ĺ, b = 10.403(1) Ĺ, c = 16.987(7) Ĺ, a = 90°, b = 108.4(2)°, g = 90°. The structure shows a center of inversion at the middle of the hydrocarbon chain which connects the two phosphorus donor sites.

 

El-mehdawi R. M., Darensbourg M. Y., Eldewik N. A.*, Trish F. A. and Ben Younes M.M

JJC, 2009, 4(3), 243-250

Ab Initio Investigations of Some 1, 2-Diols Rearrangement
Via G3 Calculations

 

Mustafa R. Helal*
and Khamis A. Abbas

JJC, 2009, 4(3), 251-269

Species Sensitive Electrochemical Method for Enrichment of
Azadirachtin-A from Neem Seed

DCP and DPP polarogrphic methods have been developed for the qualitative as well as quantitative analysis of azadirachtin in plant product and its formulation. Azadirachtin produces a well defined polarographic wave/peak in 0.1M Tetramethyl ammonium bromide (TMAB) at pH 3.3±0.1 with E˝/Ep= -1.48V/SCE

 

Kirti Thakur and K.S. Pitre*

JJC, 2009, 4(3), 271-278

Spectroelectrochemical and Theoretical Tools Applied towards an Enhanced Understanding of Structure, Energetics and Dynamics of Molecules and Polymers: Polyfuranes, Polythiophenes, Polypyrroles and their Copolymers

A brief selective, introductory overview of applications of non-classical, in particular spec­troelectrochemical and theoretical, methods, to various challenges from interfacial and ma­terials electrochemistry as well as electrochemical and chemical kinetics and thermody­namics is provided including representative il­lustrating examples with particular attention to intrinsically conducting polymers.

 

 

J. Arjomandi, F. Alakhras,
W. Al-Halasah, R. Holze
*

JJC, 2009, 4(3), 279-301

Measurement of Levels of Heavy Metal Contamination in
Vegetables Grown and Sold in Selected Areas in Lebanon

Vegetables sold in the Lebanese markets are likely to adsorb and/or absorb toxic heavy metals from implantation till they reach the consumer. The samples were purchased randomly from four major areas in Lebanon, namely Beirut, Jounieh, Tripoli, and Koura. The levels of four selected toxic heavy metals; lead, cadmium, chromium, and arsenic were determined in a total of 181 vegetable samples of which 66 are leafy vegetables, 84 are over ground vegetables, and 31 are underground grown vegetables. Overall, the levels ranged from non-detectable to 3.0904 µg/g for Pb, 0.0137 to 3.6170 µg/g for Cd, non-detectable to 19.55 µg/g for Cr, and non-detectable to 0.0636 µg/g for As, where µg/g refers to the weight of the metal per gram of dry sample weight. In all samples, the leafy vegetables contained considerably higher levels for all metals as compared to overground or underground vegetables. Washing the samples thoroughly with water before analysis has decreased the concentrations of toxic metals, more significantly so, for As.

 

Nadine Al-Chaarani,
John Hanna El-Nakat
*,
Pierre J Obeid, Samer Aouad

JJC, 2009, 4(3), 303-315