Browsing Division of Chemical Sciences by Title
Now showing items 661-680 of 1469
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N-Heterocyclic Carbene (NHC)-Catalyzed Stereoselective Synthesis of Six-Membered Heterocycles and Carbocycles
N-Heterocyclic carbene (NHC) based catalysis is employed for the generation of α,β-unsaturated acylazoliums followed by their interception with various nucleophiles, the formal [3+3] annulation reactions for the construction ... -
N-Heterocyclic Carbene-Catalyzed Enantioselective Synthesis of Dihydrothiopyranones, Functionalized Benzofurans and Extending Michael Acceptor Aldimine Umpolung
Carbenes exhibit high reactivity as divalent species with six electrons in their valence shell. Their electrophilic nature arises from an incomplete octet. However, when a heteroatom is introduced adjacent to the carbene ... -
N-Heterocyclic Carbene-Catalyzed Enantioselective Synthesis of C-O Axially Chiral Diaryl Ethers, Tricyclic Lactones and Lactams
N-heterocyclic carbene (NHC)-catalyzed transformations with distinctive activation modes allow the facile synthesis of atropoisomers. In this context, we have demonstrated the NHC-catalyzed synthesis of axially chiral diaryl ... -
N-Heterocyclic Carbene-Catalyzed Synthesis of C–N Atropisomers and Heteroatom Chiral Molecules
Asymmetric catalysis has received worldwide interest due to the increasing demand for optically pure compounds in pharmaceuticals, agrochemicals, natural products, and materials science. Traditionally, research in this ... -
N-Heterocyclic Carbene-Catalyzed Synthesis of Oxazolones, e-Lactones and N-N Axially Chiral Molecules
The diverse reactivity of N-heterocyclic carbenes (NHCs) in organocatalysis is due to the possibility of different modes of action. Although NHC-bound enolates and dienolates were well-known, the NHC-bound cross-conjugated ... -
N1 and N4 substituted sulphanilamides : Synthesis of N- substituted, (anils, ancyls, sulphony1, and azo)-derivatives of sulphathiazole and sulphapyridine
The present thesis consists of five parts, of which the first two deal with the preparation of the two well?known sulphanilamide drugs, sulphathiazole and sulphapyridine, and of their starting materials. The last three ... -
Nano-engineering in Ionic Liquid: From Fundamentals to Advanced Catalysis
Harnessing nanostructured materials of metals has led to the development of various synthetic methodologies. Although various strategies have been developed, challenges still remain obtaining desired shape, size, and ... -
Nanocrystals and nanocrystalline films of metal oxides and related materials
Certain observations and conclusions regarding the investigations presented in Chapters 5 to 9 are described here. The analysis is in relation to the ‘SCOPE OF THE WORK’ indicated in Chapter 1. The present work is mainly ... -
Nanomaterials for Magnetism and Catalysis
Nanomaterials possess unique physical and chemical properties allowing for advancement and innovation in diverse scientific and technological fields. The remarkable magnetic and catalytic properties of these nanomaterials ... -
Nanoparticle Mediated Suppression of Protein Aggregation
(2018-05-11)The increasing demands for biopharmaceuticals to treat different diseases have raised concerns about controlling the quality and efficacy of such pharmaceuticals. The design and formulation of a stable protein or peptide ... -
NanoPhotoCatalysis: A New Dimension in Synthetic Chemistry
Photocatalysis has emerged as a powerful tool in recent years to drive chemical transformations via electron/energy transfer, allowing access to several unstable or high energy intermediates. Thus, the design and ... -
Nanostructured Assemblies Based On Metal Colloids And Monolayers: Preparation, Characterisation And Studies Towards Novel Applications
(Indian Institute of Science, 2005-12-08)Nanoscience dominates virtually every field of science and technology in the 21st century. Nanoparticles are of fundamental interest since they possess unique size- dependent properties (optical, electrical, mechanical, ... -
Nanostructurization of Transition Metal Silicides for High Temperature Thermoelectric Materials
(2018-03-06)Transition Metal Silicides (TMS) are well known refractory materials because of their high thermal and structural stability at elevated temperature. In addition TMS materials are known for their moderate thermoelectric ... -
Nature of Local Interactions at cisPro-Aro Peptide Sequences in Proteins : Evidences for van der Waals type Interactions. Design and Synthesis of Novel Covalent Surrogates for the Peptide Hydrogen Bond
(2017-12-03)This thesis titled, “Nature of Local Interactions at cisPro-Aro Peptide Sequences in Proteins: Evidences for van der Waals type Interactions. Design and Synthesis of Novel Covalent Surrogates for the Peptide Hydrogen Bond”, ... -
Nature Of Solute-Solvent Interaction : Effect Of Solvent Polarity On Excited State Structure Of 2,2,2-Trifluroacetophenone And Effect Of Hydrogen Bonding In Hydrated Electron Absorption Spectrum
(2009-09-02)In solution, the environment around the solute is determined solely by the solvent molecules, which are present closer to the solute. This interaction between solute and solvent shell is very crucial for equilibrium structure ... -
New Anions In The Assembly Of The Open-Framework Compounds : Synthesis, Structure And Properties
(2013-02-18)Open-framework inorganic materials constitute an important area of study in materials chemistry, because of their potential applications in areas such as sorption and catalysis. After the discovery of nanoporous aluminium ... -
New Anthraquinone & Xanthone based Ligands as Potential Anti Cancer Agents via Selective Stabilization of G Quadruplex DNA and Theoretical Insights into G Quadruplex RNA Binding with Certain Small Molecules
In recent years, different small molecules have been synthesized for selective stabilization of G-quadruplex DNA structures over the most abundant double-stranded duplex DNA. Stabilization of G-quadruplex DNA by small ...