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Showing 1 to 20 of 25 for “"Nucleophilic displacement"”.
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Nucleophilic Displacement of Substituents in Hindered Aromatic Ketones
Made available in DSpace on 2014-12-05T19:35:55Z (GMT). No. of bitstreams: 1 0009069.pdf: 5230208 bytes, checksum: 9198e67bc0684b5dc24377aa7590c318 (MD5) Previous issue date: 1954
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Nucleophilic displacement reactions of some carbohydrates in dimethyl sulphoxide
… of toluene-p-sulphonic acid rather than nucleophilic substitution. The results of the work are presented within the context of possible approaches to converting pentoses into hexoses by way of chain extension reactions at the C-5 carbon atom of pentofuranoses.
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Nucleophilic displacement reactions of some carbohydrates in dimethyl sulphoxide
… of toluene-p-sulphonic acid rather than nucleophilic substitution. The results of the work are presented within the context of possible approaches to converting pentoses into hexoses by way of chain extension reactions at the C-5 carbon atom of pentofuranoses.
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Studies of nucleophilic displacement at nitrogen of hydroxylamine derivatives
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:55:18Z Item is restricted indefinitely.
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Reactivity studies of phosphoric amides and esters
… trifluoromethanesulphonic acid. Intramolecular nucleophilic displacement of the halide ion from secondary β-chloroethyl-substituted phosphoramidates X₂P(O)NHCH₂CH₂Cl, diamidates (RO) (MeNH)P(O)NHCH₂CH₂Cl and β-chloroethyl phosphates Y(MeO)P(O)OCH₂CH₂Cl, was studied under conditions of …
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A study of the displacement of halogen from chlorinated heteroaromatic azines by dialkali salts of benzoylacetone, disodio salts of certain 2-hydroxy-4-methylpyrimidines, and the methylsulfinyl carbanion
… two ring nitrogens, have been shown to undergo nucleophilic displacement of halide ion with a variety of nucleophiles. A detailed review of the relative reactivity of compounds of these classes, as well as halogenated heteroaromatic azines containing as many as four nitrogen atoms has appeared.
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Syntheses of Azido- and Diazido- 10-Methylacridinium Salts.
… diazotization of the primary amine followed by nucleophilic displacement of the diazonium salt with sodium azide.Synthesis of 4-azido-9-amino-10-methylacridinium chloride was unsuccessful at the methylation stage due to steric hindrance of the 4-acetamido group. An improved yield of …
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Synthesis of novel heterocyclic difluoro monomers via the chemistry of reissert compounds
… polymeric materials through the use of aromatic nucleophilic displacement reactions. Here, novel activated difluoro monomers were synthesized using the well established chemistry of Reissert compounds. Difunctional bis(Reissert compound)s were synthesized by the reaction of …
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Synthesis and Antiviral Evaluation of Some 3'-Carboxymethyl-3'-deoxyadenosine Derivatives
… 5'-activation (TosCl) followed by efficient nucleophilic displacement with tetramethylguanidinium azide. Compound 4 was converted to a 5'-[(N-methylcarbamoyl)amino] derivative (5) via one-pot reduction/acylation employing H2/Pd-C followed by treatment with p-nitrophenyl N-methylcarbamate. The …
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Synthesis and characterization of poly(arylene ether)s containing phosphorus, sulfur and heterocyclic pendant moieties
… monomers were then successfully polymerized by a nucleophilic displacement reaction to prepare poly(arylene ether)s of both high and controlled molecular weight. The novel poly(arylene ether)s based on phenolphthalein had glass transition temperatures ranging from 265 to 312 °C. Furthermore, the …
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Syntheses of selected mono- and di-esters of phosphoric acid and stability constants of their copper (II) complexes
… susceptibility of the 4-nitrophenoxy moiety to nucleophilic displacement reactions, resulted in simplification of the target models to a pair of monoesters (R₃O)PO₃H₂ and a pair of diesters (R₃O)(R₄O)P(O)O⁻Na⁺ where R₃ = 1-naphthyl group (monoester (A) or diester (C)) or 8-quinolyl group …
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Synthesis and characterization of phosphorus containing poly(arylene ether) systems
… which would be susceptible to the desired nucleophilic aromatic substitution polycondensation was achieved via Grignard routes. Thus, bis (4-fluorophenyl)phenyl phosphine oxide and bis (4-fluoropheny) methyl phosphine oxide were found to undergo successfully polymerization by a nucleophilic …
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Anthraquinone-peptide conjugates as inhibitors of DNA transcription factor binding.
… were attached to 1- chloroanthraquinone Via a nucleophilic displacement reaction and subsequently coupled to the N-terminus of the resin bound peptides using PyBOP. Characterisation of the peptides and the intercalator-linked peptides was conducted using HPLC~ MALDI-MS and 2D-NMR spectroscopy. …
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Bicyclic Heterocyclic Systems Derived from 1, 3, 4-Trisubstituted Pyridines
… of these precursors into bicyclic systems. Nucleophilic displacement of the nitro group in 4-nitronicotinic acid 1-oxide by amines and alcohols gives a series of 3,4-disubstituted pyridine 1-oxides; with methyl hydrazine as the nucleophile, ring closure occurs to give …
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Enhancing the cooperative binding properties of1,1'-bis(1,2,3,4-tetrahydroisoquinolines)
… cycloaddition of terminal unsaturated groups and nucleophilic displacement of the chlorine of the corresponding known bischloroacetyl derivative afforded representative examples of new ligand types for future study. 1,1'-Bis(1,2,3,4-tetrahydro-6,7-dimethoxyisoquinoline) was found to readily …
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New extended methine dyes for application in laser technology
… containing groups capable of intramolecular nucleophilic displacement of the chlorine atom. Thus under suitably forcing reaction conditions intramolecular cyclisation occurred, giving a series of extended donor-acceptor chromophores containing fused heterocyclic residues, the absorption …
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The development of directing group enabled hydroamination strategies to access to 1,2-, 1,3-, and 1,4- diamines with high levels of regio-, chemo-, and stereoselectivity
… and step-intensive approaches such as nucleophilic displacement and resolution. We report the mild Rh-catalyzed enantioselective hydroamination of allylamines to afford chiral 1,2-diamines in good yields and excellent enantioselectivities. This transformation is impeccably …
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The electrophilicity and chemistry of phosphate esters
… dimethyl(arylalkyl) phosphates are discussed. Nucleophilic displacement at the methyl ester carbon, and in particular the oxygen+ nitrogen methyl group transfer in these substrates occurs readily, complicating the synthetic procedures and lowering the stability of products. …
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