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Your search keyword '"Nagaraj, R."' showing total 83 results
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83 results on '"Nagaraj, R."'

2. Understanding the impact of fiber orientation on mechanical, interlaminar shear strength, and fracture properties of jute–banana hybrid composite laminates

Author

Nagaraj R. Banapurmath, T. S. Manjunatha, Maruthi Prashanth, Abhilash Edacheriane, and P. S. Shivakumar Gouda

Subjects
Materials science, Interlaminar shear, Polymers and Plastics, Fiber orientation, Materials Chemistry, Ceramics and Composites, Fracture (geology), Thermosetting polymer, General Chemistry, Composite material, Orientation (graph theory), Composite laminates, Microstructure
Published
2021

3. ChemInform Abstract: A Novel Reaction of Acetanilide with Nitrobenzene in DMSO. An Unusual Solvent Assisted Regioselective Aromatic Nucleophilic Substitution

Author

Nagaraj R. Ayyangar, S. N. Naik, and K. V. Srinivasan

Subjects
Solvent, Nitrobenzene, chemistry.chemical_classification, chemistry.chemical_compound, chemistry, Base (chemistry), Nucleophilic substitution, Regioselectivity, Organic chemistry, General Medicine, Solvent effects, Medicinal chemistry, Acetanilide
Abstract

The reaction of acetanilide (1) with nitrobenzene (2) in the presence of a base in DMSO yielded p -nitrosodiphenylamine (3) as the major product. This unusual regioselective formation of the deoxygenated product 3 has been rationalized in terms of solvent effects exerted by DMSO.

Published
2010

5. ChemInform Abstract: Novel Photochemical Synthesis of a Model Spiro Compound Related to Fredericamycin-A

Author

Uday R. Khire, Nagaraj R. Ayyangar, and Bipin Pandey

Subjects
chemistry.chemical_classification, Spiro compound, chemistry, Photodissociation, Fredericamycin A, Regioselectivity, General Medicine, Hydrogen atom abstraction, Combinatorial chemistry
Abstract

Photolysis of the enones 4a–c leads to regioselective hydrogen abstraction and subsequent cyclization to furnish the spiro compounds 5a–d, which on further elaboration provide the spiro dione 6, a model for the antitumour antibiotic, fredericamycin-A 1.

Published
2010

6. ChemInform Abstract: Synthesis of (.+-.)-Heritol

Author

P. K. Zubaidha, Uday S. Racherla, Subhash P. Chavan, and Nagaraj R. Ayyangar

Subjects
Chemistry, Key (cryptography), Nanotechnology, General Medicine, Construct (python library), Combinatorial chemistry
Abstract

Synthesis of (±)heritol and epi -heritol is described. The key step is the osmylation of the unsaturated ester 9a. Osmylation is used as a tool to construct the α,β-unsaturated γ-lactone system.

Published
2010

13. ChemInform Abstract: An Efficient Entry into Butenolides: Synthesis of (.+-.)-Mintlactone

Author

Nagaraj R. Ayyangar, Subhash P. Chavan, and P. K. Zubaidha

Subjects
integumentary system, Chemistry, organic chemicals, polycyclic compounds, Organic chemistry, MINTLACTONE, General Medicine
Abstract

Osmylation of β,γ-unsaturated esters and acid catalysed cyclisation of the resultant diols generate butenolides in high yields.

Published
2010

18. Electron impact mass spectra of enamine esters, ketones and nitriles

Author

R. J. Lahoti, Nagaraj R. Ayyangar, Thomas Daniel, and Arumugam Sudalai

Subjects
chemistry.chemical_compound, chemistry, Mass spectrum, Molecular Medicine, Photochemistry, Mass spectrometry, Aliphatic compound, Instrumentation, Biochemistry, Spectroscopy, Electron ionization, Enamine
Abstract

The behaviour of some enamine-esters, -ketones and -nitriles under electron impact has been investigated by means of low-resolution mass Spectrometry.

Published
1992

19. Electron impact ionized benzoylnitroanilines and theirN-alkyl andN-acyl derivatives

Author

Thomas Daniel, Arumugam Sudalai, and Nagaraj R. Ayyangar

Subjects
chemistry.chemical_classification, medicine.drug_class, Analytical chemistry, Mass spectrometry, Photochemistry, Biochemistry, Aminoketone, chemistry, Ionization, Physics::Atomic and Molecular Clusters, medicine, Mass spectrum, Molecular Medicine, Instrumentation, Spectroscopy, Electron ionization, Alkyl
Abstract

The behaviour of some benzoylnitroanilines and their derivatives under electron impact ionization was investigated by means of low-resolution mass spectrometry. Some characteristic rearrangement processes are discussed

Published
1991

23. ChemInform Abstract: Demonstration of endo-cis-(2S,3R)-Bicyclo[2.2.1]hept-5-en-2,3-dicarbonyl Unit as a Reverse-Turn Scaffold and Nucleator of Two-Stranded Parallel β-Sheets: Design, Synthesis, Crystal Structure, and Self-Assembling Properties of Norborne

Author

RANGANATHAN, D., primary, HARIDAS, V., additional, KURUR, S., additional, THOMAS, A., additional, MADHUSUDANAN, K. P., additional, NAGARAJ, R., additional, KUNWAR, A. C., additional, SARMA, A. V. S., additional, and KARLE, I. L., additional

Published
2010
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29. ChemInform Abstract: A Novel Synthesis of Unsymmetrical Azo Aromatics Inaccessible by Diazo-Coupling Reaction

Author

K. V. Srinivasan, S. N. Naik, and Nagaraj R. Ayyangar

Subjects
Reaction conditions, chemistry.chemical_compound, Chemistry, Diazo, General Medicine, Combinatorial chemistry, Acetanilide, Coupling reaction
Abstract

A novel synthesis of unsymmetrical azo aromatics inaccessible by diazo-coupling reaction is reported. The synthesis involved the reaction of acetanilides with nitroarenes under moderate reaction conditions. A reaction pathway via a nitrosoarene intermediate involving elimination of the elements of the acetate anion, is proposed.

Published
1990

30. ChemInform Abstract: A Convenient Synthesis of Spiro(4.n)dione and 2,2-Disubstituted Cyclopentane-1,3-dione System

Author

Uday R. Khire, Bipin Pandey, and Nagaraj R. Ayyangar

Subjects
chemistry.chemical_compound, Chemistry, General Medicine, Cyclopentane, Medicinal chemistry
Abstract

An efficient, one pot strategy for the synthesis of spiro [4. n]dione and 2,2-disubstituted cyclopentane-1,3-dione has been developed by using ketals and 1,2-disilyloxycyclobutene in the presence of excess BF 3.Et2O.

Published
1990

49. Synthesis of Monoazo Disperse Dyes from 5‐Amino‐3‐methyl‐1‐(3′, 5′‐disubstituted) s ‐Triazinylpyrazoles and a Study of Their Visible Absorption and Dyeing Properties*

Author

R.J. Lahoti, A G Lugade, Nagaraj R. Ayyangar, and S.R. Otiv

Subjects
Polymers and Plastics, Chemistry, Dyeing, Absorption (chemistry), Photochemistry, Spectral absorption
Abstract

A range of azo disperse dyes was prepared from new coupling components, 5-amino-3-methyl-1-(3′, 5′-disubstituted) s-triazinylpyrazoles. The new dyes have improved spectral absorption properties over the corresponding 5-aminophenylpyrazole dyes. The visible spectral and colouristic properties of the 5-amino-1 H-(s-triazinyljpyrazole and 5-pyrazolone dyes have been compared with the 5-amino-1N-phenylpyrazole and 5-pyrazolone dyes.

Published
1986

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