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Enantioselective Epoxidation of Some Aryl-Aryl a, b-Unsaturated Ketones
-- G Thirunarayanan and G Vanangamudi
Good yields of three series 39 ee (aS, bR) epoxy ketones were synthesized from theirE-conformers of substituted styryl ketones using chiral quaternary ammonium
bromide-PF6 catalyst. The yields of epoxides were more than 96%. These compounds have been characterized using the microanalytical
technique, spectral data and physical constants.
© 2010 IUP. All Rights Reserved.
Synthesis and Spectral Analysis of Coumarin Derivatives
-- H V Upadhyay, H P Pandya, A B Patel and Z M Gadhawala
Various coumarin derivatives have been synthesized by the reaction of acetyl coumarin with different
nitro anilines. The structures of all the synthesized products have been confirmed by spectral analysis.
© 2010 IUP. All Rights Reserved.
ImatiniB-Induced Silver Nanoparticle Aggregation Analyzed by Surface Spectroscopic and Microscopic Techniques
-- V Srinivasan, S K Thabasum Sheerin and B Karthikeyan
There are numerous potential uses of nanosilver aggregation in analytical chemistry. In this study,
ImatiniB (IB)-induced nanosilver aggregation in Ag colloid and Ag-coated filter paper has been studied using
surface spectroscopic and microscopic procedures. The obtained results showed that the ability of nanometal
aggregation can be used as the detection technique of the drug IB at its very low concentrations.
© 2010 IUP. All Rights Reserved.
Conversion of Low-Grade Indian Clays to Zeolite NaA
-- S K Sharma and S S Sambi
Zeolites form an important class of inorganic materials with an enormous industrial interest, which
derives from their molecular sieving, ion-exchange and catalytic properties. The use of Zeolite NaA in laundry
detergents by replacing phosphates and in the field of metallic waste treatment is increasing. In the present
investigation, Zeolite NaA is synthesized from low-grade Indian china clays. The technique of clay conversion to
Zeolite depends on a number of parameters influenced by the origin, physicochemical nature and composition of
the clays. In the present work, three different grades of china clay were used to prepare Zeolite NaA. The
Zeolites prepared from these three grades of china clay have different CEC values of 218, 221 and 206 mg
CaCO3/g Zeolite respectively. It was noticed that the properties of synthetic Zeolite were also affected by
the reactant mole ratio. Higher
Al2O3 concentration favors low silica Zeolite formation. Further, it was noticed
that on increasing the alumina concentration, the stability of Zeolite NaA increases, i.e., its conversion to
other Zeolites is retarded, but increase in alkali concentration favors the hydroxysodalite formation.
© 2010 IUP. All Rights Reserved.
Acoustical Studies of Some Derivatives
of 4-Amino Benzoic Acid in 1,4-Dioxane
and Dimethyl Formamide at 308.15 K
-- Shipra Baluja and Pranav Inamdar
The derivatives of 4-amino benzoic acid have been synthesized and characterized by TLC, IR and
NMR spectral data. The ultrasonic velocity, density and viscosity of all these compounds were measured in 1,
4-dioxane (DO) and dimethylformamide (DMF) at 308.15 K. Various acoustical properties, such as
specific impedance (Z), isentropic compressibility
(cS), Rao's molar sound function
(Rm), van der Waal's constant
(b), molar compressibility (W), inter-molecular free length
(Lf), relaxation strength
(r), relaxation time (t) and classical absorption coefficient
[(a/f2)Cl] were calculated. The results have been interpreted in terms of
molecular interaction occurring in the solutions.
© 2010 IUP. All Rights Reserved.
Conformational Studies on Hexamethylenediamine-Bound
L-Lysine Oligomers
-- Ajay Kumar
Conformational studies on hexamethylenediamine
(HMDA)-bounde'-benzyloxycarbonyl-L-lysine
oligomers and HMDA-L-lysine-bound oligomers as a function of chain length are reported. In the case of
HMDA-bound e'-benzyloxycarbonyl-L-lysine oligomers, with the increase in chain length from 8 to 19, the
Greenfield-Fasman helicity increases from 35.8 to 63.1, and the ratio R of the intensity of the two bands (q220/q205) increases
from 0.57 to 0.76. The HMDA L-lysine oligomers at pH 6.6 and 12.6 have random coil structure and some degree
of ordered structure respectively. In sodium perchlorate, these systems show random coil with some degree
of ordered b-sheet structure. But ellipticities of the bands are low.
© 2010 IUP. All Rights Reserved.
Corrosion Behavior of Medium Carbon Steel
in Paint Industrial Effluent
-- T Sasikala and B Ramesh Babu
Corrosion is the deterioration of a material caused by its reaction with the environment, leading to serious
loss. The corrosion behavior of steel pipes influenced by the paint effluent reveals the following results: The
effluent of paint industries contains both organic and inorganic wastes that cause damages through corrosion
to Galvanized Iron Pipes (GIPs), which are frequently used in Central Effluent Treatment Plants (CETPs).
Most of the structures in a CETP are made of Medium Carbon Steel (MCS). Hence, the samples were prepared
using MCS. The pH of the untreated effluents and effluents treated by electrochemical oxidation were 3.75 and
4.73 respectively. Chemical Oxygen Demand (COD) values were found to be decreased after
electrochemical oxidation. The weight loss of the MCS coupon was widely varied in treated and untreated effluents with
respect to exposure time. Based on the results, it has been concluded that the corrosion rate of MCS in untreated
paint effluent was much severer than that of the treated one. Hence, necessary steps must be taken to minimize
the corrosion effect on MCS and GIP that are exposed to CETP. It has also been suggested that the effluents must
be treated to reduce the COD before releasing them in the environment.
© 2010 IUP. All Rights Reserved.
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