Novel transformations of pyridinium salts. by Radi Abdelkarim Othman Awartani

Cover of: Novel transformations of pyridinium salts. | Radi Abdelkarim Othman Awartani

Published by University of East Anglia in Norwich .

Written in English

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Thesis (Ph.D.) - University of East Anglia, School of Chemical Sciences, 1982.

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Open LibraryOL14512285M

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Reactions of pyridinium salts and pyridinium betaines with hydrogen peroxide: novel ring transformations to pyrroles, β-hydroxylation, and ring-opening Alan R.

Katritzky, Christopher A. Ramsden, Zuriati Zakaria, Richard L. Harlow and Stanley H. SimonsenCited by: 3. This efficient synthesis provides a novel approach to the synthesis of pyridinium salts.

A variety of new transformations involving pyridine N -oxide derivatives were published in Methods for Pd-catalyzed alkenylation of pyridine N -oxides and cross-coupling with unactivated arenes were. A Novel Ring Transformation of Pyridinium Salts as a Route to 4-Arylpyridines Article in ChemInform 34(15) April with 14 Reads How we measure 'reads'.

Synthesis and Characterizations of Pyridinium Salts Including Poly(pyridinium salt)s and Their Applications by Tae Soo Jo Dr. Pradip K. Bhowmik, Examination Committee Chair Department of Chemistry University of Nevada La Vegas Pyridinium salts, both molecular and polymeric, are an interesting class ofCited by: 2.

The synthesis of linear dye 1 has been previously reported by our synthetic strategy for dyes 2 and 3 is outlined in Scheme dyes were synthesized via two steps.

Firstly, 1,3-propanesulfonate reacted with one equivalent of 2,6-dimethylpyridine or 2,4,6-trimethylpyridine to afford S-1 and SThen dyes 2 and 3 were obtained by the reaction of S-1 or S-2 with N-ethylcarbazole-3 Cited by: Pyridine is a basic heterocyclic organic compound with the chemical formula C 5 H 5 is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom.

It is a highly flammable, weakly alkaline, water-miscible liquid with a distinctive, unpleasant fish-like ne is colorless, but older or impure samples can appear ance: Colorless liquid.

Photochemical transformations of pyridinium salts: mechanistic studies and applications in synthesis Teresa Damiano,* Daniel Morton* and Adam Nelson Received 24th April First published as an Advance Article on the web 29th June DOI: /bn The discovery, understanding and synthetic exploitation of the photochemical.

Abstract. Two novel metal complexes, namely [Tb 2 (L) 6 (H 2 O) 4]⋅(NO 3) 6 ⋅L 2 ⋅(H 2 O) 18 (1) and [Hg(L)Cl 2] n (2), were obtained by the reaction of D-π-A (D = donor, π = conjugated spacer, A = acceptor) type pyridinium inner salt dye, trans[(p-N,N-dimethylamino)styryl]-N-(2-propanoic-acid) pyridinium (L) with corresponding metal crystal X-ray diffraction analyses Cited by: 1.

Abstract. A synthetic route to potentially biocidal silsesquioxanes functionalized by quaternary pyridinium functionalities has been developed. N-Alkylation reactions of the precursor compounds 4-(2-(trimethoxysilyl)ethyl)-pyridine (5) and 4-(2-trichloro-silylethyl)pyridine (6) with iodomethane, n-hexylbromide, and n-hexadecylbromide cleanly afforded the corresponding N-alkylpyridinium salts Cited by: 4.

Photochemical Transformations of Pyridinium Salts: Mechanistic Studies and Applications in Synthesis Article (PDF Available) in Organic & Biomolecular Chemistry 5(17) October with. Back to Table of Contents. G1 A Novel Synthesis of Nitrogen Heterocycles by Ring-Opening Reactions of Pyridinium Salts.

Christopher D. Vanderwal, University of California (Irvine). The ring opening reaction of pyridinium salts dates back over a century. A novel class of 3-substituted pyridinium salts have been synthesised in high yield by a convenient two-step procedure. A new synthetic pathway to 1-substituted benzimidazolium salts has been developed and the effects of the anionic component of the salts have been studied.

The present work reports an efficient synthesis of fluorinated pyridinium salts-based hydrazones under both conventional and eco-friendly ultrasound procedures. The synthetic approach first involves the preparation of halogenated pyridinium salts through the condensation of isonicotinic acid hydrazide (1) with p-fluorobenzaldehyde (2) followed by the nucleophilic alkylation of the resulting N Cited by: 9.

slide 2: INTRODUCTION Pyridinium salts fall under the category of cationic surfactants Chemical industries have been using cationic surfactants in several applications for a long time now Surfactant facilitates in lowering the tension between two surfaces either two liquids or a solid and liquid This chemical compound has found its way into medical field as well.

Salts. Pyrylium and its derivatives form stable salts with a variety of anions. Derivatives. Many important cations are formally derived from pyrylium by substitution of various functional groups for some or all the hydrogens in the ring.

The 2,4,6-triphenylpyrilium is an important example. Chemical properties. Like other oxonium ions, pyrylium is unstable in neutral : CHEBI Vol Is December ISSN: (Print) (Online) One-pot synthesis of quaternary pyridinium salts and tetrahydropyridine derivatives of fusidane triterpenoids.

ethanesulfonyl azides as novel water-soluble reagents for the synthesis of. Title:Synthesis and Biological Activity of Quaternary Quinolinium Salts: A Review VOLUME: 23 ISSUE: 21 Author(s):Divya Utreja*, Shivali Sharma, Akhil Goyal, Komalpreet Kaur and Sonia Kaushal Affiliation:Department of Chemistry, Punjab Agricultural University, LudhianaDepartment of Chemistry, Punjab Agricultural University, LudhianaDepartment of Chemistry, Punjab Author: Divya Utreja, Shivali Sharma, Akhil Goyal, Komalpreet Kaur, Sonia Kaushal.

Pair your accounts. Export articles to Mendeley. Get article recommendations from ACS based on references in your Mendeley library. A series of previously unavailable derivatives of 2-alkyl- and 2-benzylderivatives of oxazolo[3,2-a]pyridines III were obtained via tandem ring opening and ring closure from stable mesoionic 3-acyloxazolo[3,2-a]pyridiniumolates I.

The key intermediates of this tandem transformation are N-(b-oxoethyl)pyridones-2 II obtained by Dakin-West acylation of (pyridoneyl-1)acetic by: 8.

A series of novel, efficient, air-stable, and tunable chiral bisdihydrobenzooxaphosphole ligands (BIBOPs) were developed for rhodium-catalyzed hydrogenations of various functionalized olefins such as α-arylenamides, α-(acylamino)acrylic acid derivatives, β-(acylamino)acrylates, and dimethyl itaconate with excellent enantioselectivities (up to 99% ee) and reactivities (up to TON).Cited by: Abstract.

Pyridinium salts, both molecular and polymeric, are an interesting class of multifunctional materials that exhibit liquid-crystalline and light-emitting by: 2. Diazirines are an attractive class of potential molecular tags for magnetic resonance imaging owing to their biocompatibility and ease of incorporation into a large variety of molecules.

In their Communication on page ff., W. Warren, S. Malcolmson, Q. Wang, and co‐workers show with a 15 N 2 ‐diazirine‐containing choline derivative that 15 N 2 ‐diazirine motifs are capable. bromide [bmim][br], N-butyl-pyridinium bromide [bpy][br], N-octyl-pyridinium bromide, 4-vinyl-N-butyl-pyridinium bromide employing molten salt as a medium is described.

As a preliminary our search was aimed to find if molten quaternary ammonium salt (ionized solvent) acts File Size: 1MB. Tenured Professor of Chemistry, Texas A&M University Galveston Vice President, Roumanian Academy.

Senior Research Officer, Chemistry Division, International Atomic Energy Agency, Vienna, Austria, in charge with radiopharmaceuticals. Head of the Laboratory (along with didactic activity), Isotopically Labelled Compounds of the Bucharest Institute of.

Diazonium salts – Preparation, synthetic applications and uses. DIAZONIUM SALT: I. Preparation of Diazonium salt: When primary aromatic amine is treated with nitrous acid in a cool solution, product is unstable compound, known as diazonium salt.

This reaction is known as diazotisation. Diazonium salts have the structure. Singer Robert, Harjani Jitendra. "Imidazolium-containing amino carboxylate compounds and analogs for complexing metal ions, useful as ionic liquids, for extraction of metals from liquids, and their complexes as catalysts for air purification or organic reactions", Patent Cooperation Treaty, : PIXXD2 WO A1 CAN AN NA (Winter - ), NA.

Nitrones derived from pyridinium salts have also been used for purposes other than spin trapping. Some N-methylpyridinium nitrones have been tested for anticancer activity, 21 and a nitronyl nitroxide pyridinium salt has been prepared as a spin-labelled version of the biological co-factor nicotinamide adenine dinucleotide (NAD +).

22 Related pyridinium salts have been investigated as Cited by: for accelerating novel electronics manufacturing technologies XB interactions between TEMPO and a series of halogenated pyridinium salts (where X = Cl, Br, and I) is explored using spectroscopic methods to compare the XB strength for in the field of photocatalytic organic transformations, with only a few examples reported.

Vasodilation on rat aortic rings. The vasodilation activity of X 1, X 2 and X 3 were investigated. The rat model of KCl-induced aortic ring contraction is the classic model in vitro for screening the vasodilation drugs [17, 18].The X 1, X 2 and X 3 at to 10 μM showed vasodilation activity to varying degrees in a dose-dependent manner (Figure (Figure1).

1).Author: Yi-Cun Chen, Wei Zhu, Shu-Ping Zhong, Fu-Chun Zheng, Fen-Fei Gao, Yan-Mei Zhang, Han Xu, Yan-Shan Zh. Merrifield resin was treated with 4,4′-bipyridine and 2,4′-bipyridine, respectively, to give photochromic exposure to light, reversible color changes are observable. These resins also serve as indicators because reversible color changes are observable on addition of bases, which deprotonate the benzylic position of the N-benzylpyridinium salts to by: Synlett Current Issue 10 A Useful Compound Class for Novel Arylation Strategies Solid-Supported Synthesis of Flexible Dimeric Pyridinium Salts and Their Catalytic Activities Full Text HTML PDF ( kb) Supporting Information.

N‐H 2 eterocycles: Significant advances have been made in the development of the enantioselective partial or full hydrogenation of substituted isoquinolines and isoquinolinium and pyridinium salts. The products are valuable chiral 1,2,3,4‐tetrahydroisoquinolines and piperidines (see.

The absorption spectra of solutions of certain salts [Harry Clary Jones] on *FREE* shipping on qualifying offers. This volume is produced from digital images created through the University of Michigan University Library's large-scale digitization efforts.

The Library seeks to preserve the intellectual content of items in a manner that facilitates and promotes a variety of uses. • The position of the equilibrium between the pyridine and pyridinium salt depends on the substitution pattern and nature of the substituents, but usually favours the salt.

Chemical Reaction is a smart, intelligent read with an intriguing cast of characters packed into a romantic thriller. The author whips up a cocktail of fast-moving action, witty dialogue, heartfelt romance and speculative science/5(16).

Book Series Help; Contact Portal SYNTHESIS Full-text search A Novel and Convenient Synthesis of Thiazol-2(3H)-imine-Linked Glyco­conjugates High-Yield Synthesis of Substituted and Unsubstituted Pyridinium Salts Containing a 4-Oxothiazolidine Moiety.

Page 1 Professor Anastasios Varvoglis A Tribute Anastasios Varvoglis (Tassos) was born in Athens, Greece, on the last day of (Decem ). He studied chemistry at the University of Thessaloniki (). A part of his long military service (30 months) was spent at the Nuclear Research Center “Democritus”, in Athens, where he had his first three publications in radiochemistry.

pyridine system Th. moneo and the dihydrochloride salts were found to be the best dissolvin reagentg s for the a metals and the sulphides used Pyridin. e hydrochloride was most effectiv ien the molten state wherea, pyridins e dihydrochloride wa founs tdo be quite reactiv aet room temperature when dissolved in a chloroform solution.

Microwave-assisted synthesis of novel benzodifuran-based bis(N-(het)arylthiazolamine) derivatives and their antibacterial and antimycobacterial activities, N. Baba et al., Chem. Heterocycl. Comp. 54, Structure-activity relationship of anticancer potential of 4 4/5(27).

Heteroaromatic Tripoles. 2,6-Bis(hetarenio)pyrimidinolates: Hybrids between Hetarenium Salts and Cross-Conjugated Mesomeric Betaines. Schmidt*, M. Kindermann, J. Org. Chem.62, - Charged and Betainic Nucleobases. On Syntheses and Properties of First Mesomeric Uracilylbetaines, Uracilates, and Novel Uracilium Salts.

Pyridines have been of interest to scientists across a number of disciplines. The pyridine moiety is presented in countless molecules with applications as varied as catalysis, drug design, molecular recognition, and natural product synthesis.General Papers ARKIVOC (vi) Page 72 ©ARKAT-USA, Inc A novel porphyrazine ligand tailored to homogeneous metal catalyzed transformations Matteo Parravicini, a Luca Vaghi, b Giancarlo Cravotto, c Norberto Masciocchi, b Angelo Maspero, b Giovanni Palmisano,b and Andrea Penoni b* aDipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, Milano.Keywords:Betulin, tempo+Br3 - cation, quaternized pyridinium salts, antibacterial activity, antifungal activity, Candida albicans.

Abstract: Background: A wide range of biological activity, relatively low toxicity and multiple pharmacological effects of triterpenoids are major advantages of these compounds in the prevention and treatment of Cited by: 2.

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