Relevant bibliographies by topics / Pyridinium Ylides

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Pyridinium Ylides'

Author: Grafiati
Published: 5 June 2025
Last updated: 1 August 2025

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Journal articles on the topic "Pyridinium Ylides"

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Pidlypnyi, Nazar, Sandra Kaul, Sebastian Wolf, Martin H. H. Drafz, and Andreas Schmidt. "Syntheses and Characterization of N-(Indolyl)pyridinium Salts and of Their Ylides." Zeitschrift für Naturforschung B 69, no. 5 (2014): 605–14. http://dx.doi.org/10.5560/znb.2014-3324.

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3-Methylindole reacts with pyridines in the presence of NBS to give indol-2-yl-pyridinium salts which were converted into their ylides by an anion exchange resin in its hydroxide form. Indol-3- amine was subjected to a nucleophilic ring transformation with pyrylium salts which resulted in the formation of indol-3-yl-pyridinium salts, the 2,4,6-trimethylpyridinium derivative of which proved to be unstable. The 2,4,6-triphenylpyridinium derivate was deprotonated to the corresponding ylide. The isomeric indol-2-yl and indol-3-yl derivatives are cycloimmonium ylides which are members of the compou
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Theato, Patrick, and Daniel Klinger. "Synthesis of Photoreactive Block Copolymers Based on 1-Iminopyridinium Ylides." Australian Journal of Chemistry 63, no. 8 (2010): 1164. http://dx.doi.org/10.1071/ch10079.

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Two photoreactive pyridinium ylide containing monomers, {[2-(metacryloyloxy)ethoxy]carbonyl}(pyridinium-1-yl)azanide (M1) and pyridinium-1-yl-(4-vinylbenzoyl)azanide (M2), were synthesized. Both monomers were polymerized under controlled radical polymerization conditions, i.e. reversible addition–fragmentation chain transfer polymerization (M1 and M2) and nitroxide-mediated polymerization (M2). Further block copolymers PMMA-b-PM1 and PS-b-PM2 were successfully synthesized and their molecular weight, Mn, and block ratio could be determined by 1H NMR analysis, thereby opening the synthetic possi
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Shustov, Gennady V., Michael TH Liu, and K. N. Houk. "Facile formation of azines from reactions of singlet methylene and dimethylcarbene with precursor diazirines: theoretical explorations." Canadian Journal of Chemistry 77, no. 5-6 (1999): 540–49. http://dx.doi.org/10.1139/v99-012.

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The reactions of the singlet methylene (1a) and dimethylcarbene (1b), with their diazirine precursors, diazirine (2a), and dimethyldiazirine (2b), have been studied theoretically using ab initio and density functional theory. The reaction has no activation barriers for the parent system (1a + 2a) and proceeds via a reactive complex and a transition state with a small negative enthalpy of activation Δ Hnot =298 = -1.1 kcal mol-1, ΔSnot =298 = -34.4 cal mol-1 K-1, ΔG°298 = 9.2 kcal mol-1) for the dimethyl derivatives (1b + 2b). The formation of N-methylene diazirinium ylides (3a,b) is exothermic
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Seifi, Mohammad, S. Yousef Ebrahimipour, Jim Simpson, Michal Dusek, Vaclav Eigner, and Hassan Sheibani. "Combination of Pyridinium and Isoquinolinium Ylides with Phenylisocyanate and Isothiocyanates: Synthesis, Characterisation, and X-Ray Crystal Structures of Mesoionic Monosubstituted 3-Oxo-Propanamides or Thioamides." Australian Journal of Chemistry 68, no. 10 (2015): 1577. http://dx.doi.org/10.1071/ch15113.

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Pyridinium ylides derived from 2-bromoacetophenone or methyl bromoacetate have been reacted with phenylisocyanate, phenyl- or methylisothiocyanate to afford mesoionic monosubstituted 3-oxo-propanamides or thioamides, via self-protonation of the intermediate N-anion. A similar reaction under the same conditions of isoquinolinium ylides with phenylisocyanate or phenyisothiocyante also produced the corresponding mesoionic compounds. In order to establish the exact structure of the mesoionic compounds, single crystal X-ray structures were obtained for three of the pyridinium ylides.
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Liao, Fan, Wenhuan Huang, Biao Chen, et al. "Are pyridinium ylides radicals?" Chemical Communications 56, no. 76 (2020): 11287–90. http://dx.doi.org/10.1039/d0cc04604c.

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Grünefeld, Johann, Wolfgang Kliegel, Steven J. Rettig, and James Trotter. "Reaction of diphenylborinic acid with pyridinium and phosphonium bisacyl methylides. Crystal and molecular structures of resulting B,N- and B,P-betaines." Canadian Journal of Chemistry 77, no. 4 (1999): 439–50. http://dx.doi.org/10.1139/v99-067.

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Reaction of pyridinium and phosphonium 2-carboxy-1-formyl-2-oxoethylides with oxybis(diphenylborane) yields 5-(2-oxo-1-(pyridinio or phosphonio)ethylidene)-2,2-diphenyl-1,3-dioxa-2-borata-4-cyclopentanones, which represent novel types of boron nitrogen and boron phosphorus betaines, respectively. Crystals of 5-(2-oxo-1-pyridinioethylidene)-2,2-diphenyl-1,3-dioxa-2-borata-4-cyclopentanone,1a, are monoclinic, a = 15.589(3), b = 12.366(2), c = 20.1869(11) Å, β = 111.227(2)°, Z = 8 (two independent molecules), space group P21/a; and those of 5-[2-oxo-1-(triphenylphosphonio)ethylidene]-2,2-diphenyl
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Motornov, Vladimir A., Andrey A. Tabolin, Yulia V. Nelyubina, Valentine G. Nenajdenko, and Sema L. Ioffe. "Copper-mediated oxidative [3 + 2]-annulation of nitroalkenes and pyridinium ylides: general access to functionalized indolizines and efficient synthesis of 1-fluoroindolizines." Organic & Biomolecular Chemistry 17, no. 6 (2019): 1442–54. http://dx.doi.org/10.1039/c8ob03126f.

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Popa, Marcel Mirel, Emilian Georgescu, Mino R. Caira, et al. "Indolizines and pyrrolo[1,2-c]pyrimidines decorated with a pyrimidine and a pyridine unit respectively." Beilstein Journal of Organic Chemistry 11 (June 26, 2015): 1079–88. http://dx.doi.org/10.3762/bjoc.11.121.

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The three possible structural isomers of 4-(pyridyl)pyrimidine were employed for the synthesis of new pyrrolo[1,2-c]pyrimidines and new indolizines, by 1,3-dipolar cycloaddition reaction of their corresponding N-ylides generated in situ from their corresponding cycloimmonium bromides. In the case of 4-(3-pyridyl)pyrimidine and 4-(4-pyridyl)pyrimidine the quaternization reactions occur as expected at the pyridine nitrogen atom leading to pyridinium bromides and consequently to new indolizines via the corresponding pyridinium N-ylides. However, in the case of 4-(2-pyridyl)pyrimidine the steric h
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Choyal, Manisha. "Structural parameters of N-heterocyclic pyridinium methylides - A DFT study." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 35, no. 02 (2025): 342. https://doi.org/10.59467/ijhc.2025.35.342.

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The present communication includes an investigation of the structural parameters of nitrogen ylides present in differently substituted pyridine rings generated as a chemical intermediate during the formation of functionalized indolizine derivatives via [3+2]/1,3-dipolar cycloaddition. Remarkable experimental observations such as hydrogen bonding and delocalization of charge density have been made through computational calculation based on geometry optimization of ylides.. KEYWORDS :Cycloaddition reactions, Density functional theory, N-Heterocyclic ylides, Stereoelectronic effects.
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Cui, Zhaohui, Kuan Zhang, Lijie Gu, Zhanwei Bu, Junwei Zhao, and Qilin Wang. "Diastereoselective trifunctionalization of pyridinium salts to access structurally crowded azaheteropolycycles." Chemical Communications 57, no. 74 (2021): 9402–5. http://dx.doi.org/10.1039/d1cc03478b.

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A highly diastereoselective dearomative trifunctionalization of pyridinium salts with multifunctional o-hydroxy aromatic azomethine ylides has been established to assemble challenging and architecturally crowded fused pentacycles.
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Dissertations / Theses on the topic "Pyridinium Ylides"

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Abdullah, Rasha Azzam. "Investigating the chemistry of pyridinium ylides." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49095/.

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This thesis describes investigation into catalytic formation of pyridinium ylides from diazo compounds and their subsequent reactivity. In particular, cycloaddition reactions with electrophilic alkenes are performed to generate tetrahydroindolizines that can be transformed into indolzidines by reduction. Pyridinium ylides have been shown to be very reactive intermediates that are able to generate complex molecules with excellent yield and diastereoselectivity. The introduction section provides a background on the chemistry of pyridinium ylides. This section also reports on development in the f
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Douelle, Frederic. "Preparation of pyridinium and diaminocarbonium barbituric acid ylides." ScholarWorks@UNO, 2003. http://louisdl.louislibraries.org/u?/NOD,48.

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Thesis (M.S.)--University of New Orleans, 2003.<br>Title from electronic submission form. "A thesis ... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Chemistry"--Thesis t.p. Vita. Includes bibliographical references.
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Tongue, Tom. "Novel (3+2) dipolar cycloadditions of pyridinium ylides." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/41558/.

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This thesis describes advances in novel (3+2) dipolar cycloadditions of pyridinium ylides, their reactions with electrophilic alkenes afford tetrahydroindolizines which can possess alkaloid-like scaffolds. Pyridinium ylides have been shown to be highly reactive intermediates that are able to rapidly generate molecular complexity with excellent regio and diastereoselectivity. Chapter one reports an introduction on the chemistry of pyridinium ylides and introduces spirocyclic indolizidine containing natural products which could conceivably be synthesised through (3+2) dipolar cycloadditions. The
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Book chapters on the topic "Pyridinium Ylides"

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Schmidpeter, A., and K. Karaghiosoff. "[1,5] Electrocyclization of Pyridinium Ylides." In Five-Membered Hetarenes with Two Nitrogen or Phosphorus Atoms. Georg Thieme Verlag KG, 2002. http://dx.doi.org/10.1055/sos-sd-012-00893.

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Schmidpeter, A., and K. Karaghiosoff. "[3+2] Cycloaddition of Pyridinium and Related Ylides with Phosphaalkynes." In Five-Membered Hetarenes with Two Nitrogen or Phosphorus Atoms. Georg Thieme Verlag KG, 2002. http://dx.doi.org/10.1055/sos-sd-012-00892.

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Kollenz, G. "Reaction of Pyridinium Ylides with 2,3-Diphenylcycloprop-2-en-1-one." In Three Carbon-Heteroatom Bonds: Thio-, Seleno-, and Tellurocarboxylic Acids and Derivatives; Imidic Acids and Derivatives; Ortho Acid Derivatives. Georg Thieme Verlag KG, 2006. http://dx.doi.org/10.1055/sos-sd-023-00354.

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Conference papers on the topic "Pyridinium Ylides"

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Schwalm, Reinhold, Andreas Bottcher, and Horst Koch. "MID UV Resist Materials Containing Pyridinium Ylides." In 1988 Microlithography Conferences, edited by Scott A. MacDonald. SPIE, 1988. http://dx.doi.org/10.1117/12.968297.

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Ciorteanu, Roxana Elena, Monica Sardaru, Dumitrela Diaconu, Ionel Mangalagiu, and Ramona Danac. "Synthesis and anticancer properties of new indolizinic derivatives." In Scientific seminar with international participation "New frontiers in natural product chemistry". Institute of Chemistry, Republic of Moldova, 2023. http://dx.doi.org/10.19261/nfnpc.2023.ab25.

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Natural compounds with indolizine scaffolds have demonstrated numerous biological activities and have found use in medical research laboratories. Thys, the unique indolizine scaffold became an important system for the development of new drug candidates in medicinal chemistry. [1,2] Several indolizines with excellent anticancer activity and tubulin polymerization inhibitory potency have been reported recently, and our group contributed also to the field. [1,3] The goal of this study was the design, synthesis and anticancer evaluation of several new derivatives with symmetrical or unsymmetrical
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Dorohoi, Dana Ortansa. "Symmetry Properties and the Electronic Transitions of Some Pyridinium-Ylids." In SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP, 2007. http://dx.doi.org/10.1063/1.2733187.

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Journal articles
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