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Volume 4, No. 1, March 2009, Rabia 2 1430 H

Reviews

 

 

 Synthesis of Fused Pyrimidines and Purines by Vicarious Nucleophilic Substitution of Hydrogen (A Microreview)

Fused pyrimidines can be easily synthesized from the corresponding ortho-aminobenzylamine derivatives or their heteroanalogues. Often the limiting factor for the above syntheses is the difficulty encountered in obtaining the key intermediates or their precursors. Recently, this problem was successfully solved in several ways by the use of vicarious nucleophilic substitution of hydrogen (VNS). As a result, many quinazolines and new bicyclic and tricyclic heteroaromatic compounds and their mono-N-oxides were obtained, when starting from nitroarenes. These approaches were also successfully applied to the synthesis of purines with the use of 4-nitroimidazole derivatives.

 

 

Stanisław Ostrowski

JJC, 2009, 4(1), 1-15

Synthesis, Characterization and Reactions of CpFe(CO)2EZ
[E= S, Se. Z= COR, SO2R, CO2R, C(S)OR, CS2Ph, COCO2R]

The iron chalcogenides complexes (m-Ex)[CpFe(CO)2]2 (E= S; x= 2-4, E= Se; x= 1) served as excellent precursors for sulfur- or selenium-containing iron complexes. They are reactive toward acid chlorides, sulfonyl chlorides, chloroformates, chlorothioformates, chlorodithioformates, and O-alkyloxalyl chlorides. These reactions produced complexes of the general formula CpFe(CO)2EZ (E= S, Se; Z= COR, SO2R, CO2R, C(S)OR, CS2R, COCO2R). Treatment of these chalcogenides with terephthaloyl chloride gave either [CpFe(CO)2ECO]2(4-C6H4) or CpFe(CO)2ECO-4-C6H4COCl, depending on the molar ratio of the reactants.  The latter complexes react with amines, phenols, carboxylic acids and thiols to give the bi-functional products CpFe(CO)2ECO-4-C6H4COY (Y= NR2, OAr, OCOR, SR).

 

 

Mohammad El-khateeb*,
Ibrahim Jibril

JJC, 2009, 4(1), 17-32

 

Articles

 

 

Catalytic Dimerization of Propene with a Bis(salicylaldiminato)Nickel(II) Catalyst using 2,4,6-Trichlorophenol for Isomerization Reactions

Propylene was dimerized with a bis(salicylaldiminato)nickel complex in combination with aluminum trichloride/triethylaluminum and phosphine compounds as additives. Further addition of a chlorinated phenol derivative lead to isomerization of the produced propylene dimers and an increased selectivity towards the desired 2,3-dimethyl-2-butenes compared to the phenol-free catalytic systems.

 

Helmut G. Alt*,
Katharina J. Schneider,
Christian Görl

JJC, 2009, 4(1), 33-43

“Like Phoenix from the ashes”! Thermally decomposed metallocene complexes as catalysts for CH activation  reactions

Methylalumoxane (MAO) activated metallocene and amido functionalized ansa half sandwich complexes with group 4 metals are able to activate linear and cyclic alkanes at temperatures in the range of 300-400°C to give the corresponding alkenes, branched isomers and C,C coupling products without a hydrogen acceptor. The new catalytic species are supposed to be MAO cages  incorporating metallocene fragments.

 

 


 

Helmut G. Alt*, Christine E. Denner, Sandra Taubmann

JJC, 2009, 4(1), 45-54

An Optical Chemical Sensor Based on Polymer Swelling and Shrinking using Dithiocarbamate-Polymer Microspheres

Swellable polymer-based sensor for heavy metals

 

 

I. Odeh, S. Siam, M. Khatib, Z. Shakhsher*

JJC, 2009, 4(1), 55-64

Spectrophotometric Determination of Antipsychotic Drug Olanzapine in Pharmaceuticals

Two new sensitive spectrophotometric methods have been developed for the analysis of the antipsychotic drug, olanzapine (OLP) in pharmaceuticals. Quantitation of  OLP was done by oxidation with measured excess of Ce(IV)SO4 in acid medium and the unreacted Ce(IV)SO4 was determined spectrophotometrically by using either N-phenyl-anthranilic acid or sulphanilic acid as an auxillary reagent.

 

 

Kanakapura Basavaiah*,
Kalsang Tharpa, Nagaraju Rajendraprasad, Salmara G Hiriyanna, Kanakapura B Vinay

JJC, 2009, 4(1), 65-76

Assessment of Trace Metal Distribution and Contamination
in Surface Soils of Amman, Jordan

Street dust samples were collected from four different localities (busy and main roads, industrial, tunnels and residential roads) located in the greater Amman area of Jordan. After digestion, all samples were analyzed for their content of Pb, Cd, Zn, Cu, Cr, Co and Ni. Highest concentrations for Cu, Zn, Cr and Ni were observed in the industrial area, whilst maximum lead concentrations were observed in tunnels and busy roads. Enrichment factor calculations indicated that Pb, Cu, Cd and Zn are highly enriched. A multivariate statistical approach (Principal Component Analysis) was also used to define the possible origin of metals in dusts.

 

Idrees F. Al-Momani*

JJC, 2009, 4(1), 77-87

Simple Spectrophotometric Determination of Reactive Dyes after Preconcentration using Activated Carbon

Commercial activated carbon was found efficient for extraction of Levafix Brilliant Blue E-4BA and Levafix Brilliant Red E-4BA at trace levels from solution. The multiwalled carbon nanotube adsorbent outperformed commercial activated carbon for dyes extraction from solution. A simple analytical procedure based on dyes preconcentration by activated and nanotube activated carbons was presented. The best detection limits of the proposed method were 20 and 30 ng L-1 for red and blue dye; respectively.

Levafix Brilliant Red E-4BA.

 

 

Ayman A. Issa, Yahya S.
Al-Degs*

JJC, 2009, 4(1), 89-101