Relevant bibliographies by topics / Keywords: Pyridines

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Academic literature on the topic 'Keywords: Pyridines'

Author: Grafiati
Published: 7 June 2025
Last updated: 2 August 2025

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Journal articles on the topic "Keywords: Pyridines"

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Werstiuk, Nick Henry, and Chen Ju. "Protium–deuterium exchange of substituted pyridines in neutral D2O at elevated temperatures." Canadian Journal of Chemistry 67, no. 1 (1989): 5–10. http://dx.doi.org/10.1139/v89-002.

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H–D exchange of a series of pyridines 1–15, 10H-pyridino[3,2-b][1,4]benzothiazine (16), phenothiazine (17), and aniline has been carried out in neutral D2O at elevated temperatures. The substrates undergo selective exchange and are generally isolated in good yield. Cyanopyridines 4,5, and 6 hydrolyze readily in D2O at elevated temperatures, and the resultant carboxylic acids decarboxylate. This reaction provides a convenient one-step route to selectively labelled pyridines. Possible mechanisms of exchange are presented. Keywords: protium–deuterium exchange, substituted pyridines, temperature e
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2

Dr.N.Sandeepthi, Nellutla Jhancy Laxmi* Kummari Eshwaramma. "FORMULATION AND OPTIMIZATION OF FLOATING LIPID BEADS OF RUPATADINE FOR THE ENHANCED BIOAVAILABILITY AND ITS PHARMACOKINETIC APPLICATIONS." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES 05, no. 11 (2018): 11686–97. https://doi.org/10.5281/zenodo.1480948.

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<em>The development of oral drug delivery systems for poorly soluble basic drugs is problematic because of their pH dependent solubility. Poorly water soluble basic drugs are very sensitive to pH changes, and following oral administration and dissolution in the acidic stomach environment, they tend to precipitate upon gastric emptying to higher pH medium in the intestine, leading to compromised or erratic oral bioavailability. Rupatadine is a second-generation antihistamine, long-acting histamine antagonist, with selective peripheral H1-receptor antagonist activity. Some of the metabolites (de
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3

Devi, Sushma, Ankita Sharma, Veeresh Karoshi, Sunil Kumar, Ajay Kumar, and Jayant Sindhu. "Metal-Free Synthesis of 2-Aminothiazole Functionalized Imidazo[1,2-a]pyridines as Antibacterial Agents." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 34, no. 01 (2024): 23. http://dx.doi.org/10.59467/ijhc.2024.34.23.

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The present work describes the synthesis, characterization, and in silico studies of some new 2-aminothiazole functionalized imidazo[1,2-a]pyridines (1a-h). The targeted compounds were synthesized by the Hantzsch?s thiazole reaction involving the condensation reaction of a-bromomethyl ketones with 1-(3-nitroimidazo[1,2-a]pyridin-2-yl)thiourea (2). The key precursor 2 was synthesized by four steps method using 2-aminopyridine and chloroacetic acid as commercially available starting materials. The synthesized compounds 1a-1h displayed considerable activity against Gram-positive bacteria. In part
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Anantwad, Santosh A., Amol R. Suryawanshi, and Prof.Hussain Sayyed. "Two-step One-Pot Multicomponent Reaction Improved by TBAF for the Preparation of 2-Amino-3, 5-dicyano-4-aryl-6-phenylsulfanylpyridines." International Journal of Advance and Applied Research 12, no. 2 (2024): 196–99. https://doi.org/10.5281/zenodo.14644129.

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<strong>Abstract:</strong>&nbsp;&nbsp;&nbsp;&nbsp; To further explore TBAF's catalytic properties, a study investigated its role in the synthesis of 2-amino-3, 5-dicyano-4-aryl-6-sulfanyl-pyridines under mild conditions. Two-step One-Pot Multi-component reaction (MCR) synthesis of pyridines derivatives using TBAF as the catalyst was conducted across different organic solvents. The formation of 1a was observed in polar solvents like methanol, acetonitrile, dimethylformamide (DMF), and ethanol, with ethanol yielding the highest yield (91%). Notably, the absence of TBAF led to no product formatio
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5

Cativiela, C., and J. I. Garcia. "Electronic effects of heterocyclic substituents. Spectroscopical and theoretical (AM1) study in a series of heterocyclic carboxaldehydes." Canadian Journal of Chemistry 68, no. 9 (1990): 1477–81. http://dx.doi.org/10.1139/v90-226.

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The electronic effects of a series of 18 heterocyclic carboxaldehydes (furans, thiophenes, pyrroles, and pyridines) have been studied by means of the correlation existing between 13C chemical shifts of the carbonylic carbon and calculated total and π charges (AM1). The implications of this theoretical model to explain polar and resonance contributions to the total electronic effect are discussed. Keywords: heterocyclic substituents, electronic effects, 13C NMR, DSP models.
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6

Hanan, Garry S., Ulrich S. Schubert, Dirk Volkmer, et al. "Synthesis, structure, and properties of oligo-tridentate ligands; covalently assembled precursors of coordination arrays." Canadian Journal of Chemistry 75, no. 2 (1997): 169–82. http://dx.doi.org/10.1139/v97-020.

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Oligo-tridentate ligands based on alternating pyridines and pyrimidines were synthesised by Stille-type carbon–carbon bond-forming reactions. The terpyridine-like sites are designed to coalign upon metal complexation, giving rise to organized and rigidly spaced metal ions. Peripheral functionalization of the basic bis-tridentate framework was explored. The heterocycles in the ligands are in an all-trans conformation about the interannular bonds as indicated by comparison of their 1H NMR spectra. An X-ray crystal structure analysis of the nonchiral tris-tridentate ligand 2a reveals a helical st
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7

Pearson, Céline, and André L. Beauchamp. "1H NMR study of paramagnetic rhenium(III) monomers with nitrogen heterocycles. Crystal structures of ReCl3L2(PPh3) complexes (L = pyridine, 3-picoline, and 1-methylimidazole)." Canadian Journal of Chemistry 75, no. 2 (1997): 220–31. http://dx.doi.org/10.1139/v97-026.

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Rhenium(III) monomers of the type ReCl3Ln(PPh3)3−n, where n = 1,2, and 3, were prepared for simple nitrogen heterocyclic ligands L and characterized mainly by 1H NMR and IR spectroscopies. Most of the 1H NMR signals of these paramagnetic compounds were assigned by using methylated pyridines. A mer-cis octahedral geometry slightly distorted by triphenylphosphine was determined by X-ray diffraction for three ReCl3L2(PPh3) complexes: L = pyridine, triclinic, [Formula: see text], a = 11.379, b = 13.532, c = 18.160 Ǻ, α = 80.16°, β = 89.57, γ = 86.27°, Z = 4, R = 0.076; L = 3-picoline, triclinic, [
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8

Jahangir, Jian Wang, Richard W. Smith, David B. MacLean, and Herbert L. Holland. "Oxidation products of 5-ethenyl-4-methyl-3-pyridinecarbonitrile and 2- and 4-methylpyridines." Canadian Journal of Chemistry 68, no. 4 (1990): 587–91. http://dx.doi.org/10.1139/v90-090.

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The anion of 5-ethenyl-4-methyl-3-pyridinecarbonitrile 1 undergoes oxidative coupling on treatment with dibenzoyl peroxide affording 1,2-bis-(5′-ethenyl-3′-cyano-4′-pyridyl)-ethane, 2. It is also shown that the anions of 2- and 4-methylpyridine undergo oxidative coupling. In the latter case, however, the coupling reaction is accompanied by addition to the carbonyl group of dibenzoyl peroxide. The addition products have been identified as phenacyl pyridines and dipicolyl phenyl carbinols. The ethenyl side chain of 1 has been hydrated by way of the oxymercuration–reduction process and the second
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9

Gasparyan, H. V., S. A. Buloyan, A. E. Pogosyan, et al. "Pathological investigation of neuroprotective activity of new derivatives of fused pyrazolyl-thienopyridines in Corazol-induced seizures." CLINICAL AND EXPERIMENTAL MORPHOLOGY 10, no. 4 (2021): 53–62. http://dx.doi.org/10.31088/cem2021.10.4.53-62.

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Introduction. Seizures provoke several morphological alterations in the brain structures. These alterations are primarily located in the hippocampal CA1 region and the entorhinal cortex. Recurrent seizures are common in patients with epilepsy. Therapeutic options for this disease are very limited and most of them are aimed at relieving symptoms. In most cases, to treat epilepsy, anti-seizure drugs are used. Nevertheless, one-third of affected individuals have resistance to them. Thus, the study of new effective agents that can prevent epileptogenesis is still an ongoing challenge. In this work
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10

Bunting, John W., James P. Kanter, Raymond Nelander та Zhennan Wu. "The acidity and tautomerism of β-diketones in aqueous solution". Canadian Journal of Chemistry 73, № 8 (1995): 1305–11. http://dx.doi.org/10.1139/v95-161.

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The acidity and keto–enol tautomerism of a series of symmetrical β-diketones (RCOCH2COR (1): R = methyl (a), phenyl (b), 3-pyridinyl (c), 4-pyridinyl (d), 3-(N-methyl)pyridinio (e), and 4-(N-methyl)pyridinio (f)) and two series of unsymmetrical β-diketones (RCOCH2COCH3 (7a–7f) and RCOCH2COC6H5 (8a–8f)) have been investigated in aqueous solution at 25 °C and ionic strength 0.1. Values of [Formula: see text] were measured spectrophotometrically, and the acidities of the enols [Formula: see text] were obtained from the analysis of the pH dependence of the buffer catalysis for the general acid-cat
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Conference papers on the topic "Keywords: Pyridines"

1

Moreno-Hernandez, Lizbeth, Santiago Ospina-Rivas, Urel Andreas Espadín - Davila, Marko Jeran, and Rigoberto Barrios-Francisco. "Dehydrogenation of Hantzsch Dihydropyridines with Hetero-geneous Cobalt Oxide Catalyst Supported in N-Doped Acti-vated Carbon." In Socratic Lectures 7. University of Lubljana Press, 2022. http://dx.doi.org/10.55295/psl.2022.d17.

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Hantzsch dihydropyridines represent an important source of hydrogen to be transfered to other un-saturated organic molecules, leading the formation of pyridine aromatic ring as driving force. The hydrogen transfer process was evaluated using 1,4-dyhydropyridines and heterogeneous cobalt cat-alyst supported over N-doped activated carbon. The 4-position of the dihydropyridine ring was sub-stituted with H (4a), Me (4b) and Ph (4c) groups, showing that only 1 reacted to yield the correspond-ing pyridine compound indicating that the presence of steric hindrance took place on the reaction. Additiona
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