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Volume 4, No. 3, September 2009, Shawwal 1430 H
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Articles
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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.
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Shikha Gupta*,
Neha Ajmera, Priyadarshi Meena, Naveen
Gautam, Ashok Kumar,
D.C. Gautam
JJC,
2009, 4(3),
209-221
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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.
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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
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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.
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Khalil J. Asali*,
Mohammad
El-khateeb, Ahmad Daraosheh
JJC, 2009, 4(3),
233-242
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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) Å, b = 10.403(1) Å,
c = 16.987(7) Å,
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.
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El-mehdawi R. M., Darensbourg M. Y.,
Eldewik N. A.*,
Trish F. A. and Ben Younes M.M
JJC, 2009, 4(3),
243-250
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Ab Initio Investigations of Some 1,
2-Diols Rearrangement
Via G3 Calculations
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Mustafa R. Helal*
and Khamis A. Abbas
JJC, 2009, 4(3),
251-269
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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 E½/Ep= -1.48V/SCE
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Kirti Thakur and K.S. Pitre*
JJC, 2009, 4(3),
271-278
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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.
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J. Arjomandi, F. Alakhras,
W. Al-Halasah, R. Holze*
JJC, 2009, 4(3),
279-301
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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.
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Nadine Al-Chaarani,
John Hanna El-Nakat*,
Pierre J Obeid, Samer Aouad
JJC, 2009, 4(3),
303-315
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