Papers by Sandhyamayee Sahu
Indian journal of …, 2008
Cetyltrimethylammonium ceric nitrate (CTACN) has been used to oxidize some primary aliphatic and ... more Cetyltrimethylammonium ceric nitrate (CTACN) has been used to oxidize some primary aliphatic and alicyclic alcohols in acetonitrile medium and the reaction kinetics have been investigated by spectrophotometric method. The decrease in the rate with increased concentration of CTACN has been attributed to the formation of reversed micelles by the oxidant in organic medium. An asymptotic decrease in rate with increase in [CTAB] supports the reversed micellization in the reaction medium. The plots of rate constants with [substrate] reflect the partitioning of the substrate in the reversed micellar system of CTACN. The kinetic isotope effect (k H /k D) of 1.97 has been attributed to the dehydrogenation mechanism for the oxidation of alcohols.
Organic & Biomolecular Chemistry, 2014
Indian journal of chemistry. Sect. A: Inorganic, physical, theoretical & analytical, 2010
Arylthioureas, which are toxic, on oxidation by cetyltrimethylammonium dichromate in acetic acid ... more Arylthioureas, which are toxic, on oxidation by cetyltrimethylammonium dichromate in acetic acid undergo desulphurization to the corresponding non-toxic arylureas. The mechanism of the oxidation reaction has been studied spectrophotometrically. The rate of reaction is found to be dependent on [CTADC], [phenylthiourea], [acid], [surfactant], polarity of the solvents and reaction temperature. The reaction is fractional order with respect to [substrate] and is catalyzed by acid. With increase in [CTADC], the rate constant decreases. The structure of the substituents has no significant effect on the rate constant. On the basis of various observations, a mechanism has been proposed for the oxidation reaction.
Alkylammonium Ions as Carriers of Metal Oxidants
Current Organic Chemistry, 2017
Indian Journal of Chemistry Sect a Inorganic Physical Theoretical Analytical, 2009
From the isotherms of surface pressure and area of cetyltrimethylammonium dichromate, permanganat... more From the isotherms of surface pressure and area of cetyltrimethylammonium dichromate, permanganate and ceric nitrate, the anchoring area on water-air interface for each oxidant has been determined by spreading as Langmuir monolayer. The area/molecule of these oxidants with a common amphiphilic counterion, i.e., cetyltrimethylammonium ion, depends on the size of the anion counterpart indicating the existence of contact ion pair between CTA + and the anionic group in aqueous medium. However, in aqueous acetic acid subphase, the decrease in area/molecule of cetyltrimethylammonium dichromate indicates dissociation of the constituting ions.
Synthetic Communications, Apr 25, 2006
Oxidation O 0212 Selective Oxidation of Arylaldoximes by Cetyltrimethylammonium Dichromate to Ary... more Oxidation O 0212 Selective Oxidation of Arylaldoximes by Cetyltrimethylammonium Dichromate to Arylaldehydes and Arylnitriles. -Aryloximes (I) are converted selectively to nitriles (II) in excellent yields. Addition of a catalytic amount of acetic acid leads to aldehydes (III). -(SAHU, S.; PATEL, S.; MISHRA*, B. K.; Synth. Commun. 35 (2005) 24, 3123-3126; Cent. Stud. Surf. Sci. Technol., Dep. Chem., Sambalpur Univ., Jyoti Vihar 768 019, India; Eng.) -C. Oppel
Direct and residual effects of biogas residue application with nitrogen on rice yield
International Rice Research Newsletter, 1988
Oxime is a protected form of carbonyl compound and is considered to be their equivalent. Various ... more Oxime is a protected form of carbonyl compound and is considered to be their equivalent. Various methods are adopted for the deoximation processes to effectively and suitably obtain the parent or new aldehydes and ketones. Deoximation can be achieved using various processes like oxidation, reduction, hydrolysis, hydrogenation etc. using organic and inorganic reagents. Besides, some surface templated processes and photochemical processes are also used to give products in a remarkably effective way.
Oxidation Kinetics of Aryl Thioureas by Cetyltrimethylammonium Dichromate
ABSTRACT
ChemInform Abstract: Oxidation of Thiourea and Substituted Thioureas
ChemInform, 2011
Synthetic Communications, 2005
Oxidation O 0212 Selective Oxidation of Arylaldoximes by Cetyltrimethylammonium Dichromate to Ary... more Oxidation O 0212 Selective Oxidation of Arylaldoximes by Cetyltrimethylammonium Dichromate to Arylaldehydes and Arylnitriles. -Aryloximes (I) are converted selectively to nitriles (II) in excellent yields. Addition of a catalytic amount of acetic acid leads to aldehydes (III). -(SAHU, S.; PATEL, S.; MISHRA*, B. K.; Synth. Commun. 35 (2005) 24, 3123-3126; Cent. Stud. Surf. Sci. Technol., Dep. Chem., Sambalpur Univ., Jyoti Vihar 768 019, India; Eng.) -C. Oppel
Oxidation of Arylthiourea by Cetyltrimethylammonium Dichromate
Synthetic Communications, 2010
With a view to investigate the oxidation behaviors of cetyltrimethylammonium dichromate on multif... more With a view to investigate the oxidation behaviors of cetyltrimethylammonium dichromate on multifunctional groups, some arylthioureas were subjected to oxidation, both in neutral and in acidic conditions. In neutral conditions, the products were found to be a mixture of corresponding urea and isonitrile. In acidic conditions, the products were corresponding ureas only. A probable mechanism was proposed for the formation
Synthesis, 2013
Benzotriazole-mediated syntheses of novel bioconjugates of nonsteroidal anti-inflammatory drugs w... more Benzotriazole-mediated syntheses of novel bioconjugates of nonsteroidal anti-inflammatory drugs with carnosine and with amino acids were prepared in yields of 50-97% as potential drug candidates.
Synthesis, 2013
Peptidoyl benzotriazoles permit the acylation of active methylene groups of nitriles to provide C... more Peptidoyl benzotriazoles permit the acylation of active methylene groups of nitriles to provide CH-acylated nitrile enols from α-amino acids or from di-or tripeptides with no loss of chirality.
Journal of Sulfur Chemistry, 2011
Deoximation by cetyltrimethylammonium dichromate: A kinetic study
International Journal of Chemical Kinetics, 2011
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Industrial & Engineering Chemistry Research, 2011
The phase diagrams of pseudoternary mixtures of Tween80ÀbutanolÀkeroseneÀwater system were constr... more The phase diagrams of pseudoternary mixtures of Tween80ÀbutanolÀkeroseneÀwater system were constructed by visual titration. The major three domains, i.e., oil in water, bicontinuous, and water in oil microemulsions were demarcated through conductivity measurement. A sharp increase in specific conductance in increasing water content in the bicontinuous domain has been ascribed to the percolation of ions through water continuum. Temperature induced clouding behavior of the mixtures in the Winsor IV domains was investigated to find out the effect of composition on the clouding temperature. A generalized regression model was proposed considering the cloud point to be a function of surfactant/cosurfactant ratio and oil and emulsifier contents. The increase in all these parameters increases the cloud points of the mixture. In the turbid Winsor III domain, temperature has an emulsifying effect. With increase in temperature, the turbid phase separates to three different phases, which experience transparent, translucent, and turbid characteristics due to mass transfer from one phase to another. The mass transfer phenomenon was well visualized by using nickel as water-soluble and N-alkyl 4-(p-N,N-dimethylaminostyryl)pyridinium dyes as oil-soluble probes.
Microwave assisted synthesis and QSAR study of novel NSAID acetaminophen conjugates with amino acid linkers
Organic & Biomolecular Chemistry, 2014
Novel, non-steroidal anti-inflammatory drug (NSAID), acetaminophen conjugates 6a–l with amino aci... more Novel, non-steroidal anti-inflammatory drug (NSAID), acetaminophen conjugates 6a–l with amino acid linkers were synthesized utilizing benzotriazole chemistry. Biological data acquired for all the novel bis-conjugates showed (a) some bis-conjugates (6d, 6e, 6h, and 6k) exhibit more potent anti-inflammatory activity than their parent drugs, (b) the potent bis-conjugates show no visible stomach lesions in contrast to parent drugs which are highly ulcerogenic, and (c) that the potent bio-active compounds have no mortality rates or toxic symptoms at 5 fold the applied anti-inflammatory dosage. A statistically significant QSAR model describing the anti-inflammatory properties of 6a–l (N = 15, n = 3, R(2) = 0.891, R(2)cvOO = 0.770, R(2)cvMO = 0.796, F = 29.904, s(2) = 0.011) was obtained employing CODESSA-Pro that validated the observed bio-activity.
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Papers by Sandhyamayee Sahu