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1- pyridinium salts

Substituents in pyridinium salt Relative rates Isomer proportions (partial rate factors) i 0 p-ratio... [Pg.73]

A -(indol-2-yl)pyridinium salt which can subsequently be hydrolysed to an oxindole[5]. [Pg.153]

In the case of a pyridinium salt, an indirect proof of the correctness of this mechanism can be found in the presence of a heptamethine thiazolo-cyanine, together with monomethine. which results unambiguously from 19 by the known opening of the pyridine ring (Scheme 25) (52). [Pg.41]

Fluoropyridine. This isomer can be prepared in 54—81% yield by dia2oti2ation of 4-aminopyridine in anhydrous hydrogen fluoride (370,371,400). Eree 4-fluoropyridine readily undergoes self-quaterni2ation to give pyridyl pyridinium salts (401) stabili2ation can be effected as the hydrochloride salt (371,400). Numerous 4-fluoropyridinium salts, eg, 4-fluoro-l-methylpyridinium iodide, have been converted to novel penicillins (387,402). [Pg.336]

Reactive halogen compounds, alkyl haUdes, and activated alkenes give quaternary pyridinium salts, such as (12). Oxidation with peracids gives pyridine Akoxides, such as pyridine AJ-oxide itself [694-59-7] (13), which are useful for further synthetic transformations (11). [Pg.324]

Amino-5-nitrosopyrimidines also condense with benzoylacetonitrile, phenacyl-pyridinium bromide and acetonylpyridinium chloride in the presence of sodium cyanide to produce. 7-amino-6-pteridinyl ketones (63JOC1197). Pteridine syntheses from pyridinium salts are not limited to the preparation of pteridyl ketones since pyridinium acetamide... [Pg.314]

Isoxazolium salts react with enamines to give pyridinium salts (Scheme 33) (69CPB2209). [Pg.75]

The 3-chloroacrylaldehyde (218) (Type 1, Scheme 6) reacted readily with 2-amino-l,3,4-selenadiazole (219). The final product was the [l,3,4]selenadiazolo[3,2-a]pyridinium salt (220) (76ZC337X... [Pg.133]

Other heterocycles which rearrange to isoxazoles are pyridazine 1,2-dioxides (77CC856) and pyridinium salts (80CPB2083), although these transformations are of little synthetic importance. [Pg.82]

Isoxazoio[2,3-a]pyridinium salts, 2,3-dihydro-ring opening, 6, 630... [Pg.692]

Pyridinium salts, l-aryl-4-methoxy-2,6-dimethyl-synthesis, 3, 762 Pyridinium salts, N-aryloxy-rearrangements, 2, 354 Pyridinium salts, 1-benzyl-covalent amination, 2, 239 Pyridinium salts, N-benzyl-reactions... [Pg.795]

Pyridinium salts, l-ethoxy-4-methyl-thioalkylation, 2, 230 Pyridinium salts, N-ethyl- H NMR, 3, 893 Pyridinium salts, 2-halo-nucleophilic reactions, 2, 360 N-oxides... [Pg.795]


See other pages where 1- pyridinium salts is mentioned: [Pg.93]    [Pg.334]    [Pg.239]    [Pg.480]    [Pg.42]    [Pg.326]    [Pg.423]    [Pg.7]    [Pg.11]    [Pg.149]    [Pg.153]    [Pg.175]    [Pg.662]    [Pg.673]    [Pg.685]    [Pg.731]    [Pg.731]    [Pg.794]    [Pg.794]    [Pg.794]    [Pg.794]    [Pg.794]    [Pg.794]    [Pg.794]    [Pg.794]    [Pg.795]    [Pg.795]    [Pg.795]    [Pg.795]    [Pg.795]    [Pg.795]    [Pg.795]    [Pg.795]    [Pg.795]   
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1 - pyridinium salt pyridine

1 -Aryl pyridinium salts

1,2-Fused pyridinium salts, synthesis

1.2.3- Triazolo pyridinium salts

2-amino-2- - pyridinium salt

3- Aminopyridines 3-pyridyl)pyridinium salt

A-Pyridinium methyl ketone salts

Aluminum hydrides pyridinium salts

Benzylic carbons, pyridinium salts

Cobalt, bis catalyst partial reduction of pyridinium salts

Copper-zinc reagents, pyridinium salt

Crystallography pyridinium salts

Electrochemical reduction pyridinium salts

Esterification pyridinium salt

Formic acid pyridinium salts

Glycosyl pyridinium salts

Glycosyl pyridinium salts P-glycosidases inhibition

Grignard with pyridinium salts

Heterocyclic betaines: pyridinium azolate inner salts with several interannular

Heterocyclic betaines: pyridinium imidazolium) azolate inner salts with

L- pyridinium salts

Lactonization pyridinium salt

Lukes reduction pyridinium salts

Methylphenyl)sulfonyl amino -pyridinium inner salt

N-Alkoxy Pyridinium Salts

Nicotinamide pyridinium salt

Nucleophilic addition to pyridinium salts

Potassium borohydride pyridinium salts

Preparation from the Pyridinium Salt

Pteridines pyridinium salts

Pyrazolo pyridinium salts

Pyridine A-oxides and pyridinium Salts

Pyridinium and imidazolium azolate inner salts

Pyridinium azolate inner salts

Pyridinium cations/ions/salts

Pyridinium salt - alkene

Pyridinium salt amine

Pyridinium salt amine 2518 Transformation

Pyridinium salts ANRORC reaction

Pyridinium salts Grignard addition

Pyridinium salts Ortoleva-King reaction

Pyridinium salts addition reactions

Pyridinium salts borohydrides

Pyridinium salts dihydropyridine

Pyridinium salts dithionite reduction

Pyridinium salts electrophilic substitution

Pyridinium salts enolate addition

Pyridinium salts formation

Pyridinium salts hydrolysis

Pyridinium salts lithium aluminum hydride reduction

Pyridinium salts nucleophilic addition

Pyridinium salts nucleophilic substitution

Pyridinium salts oxidation

Pyridinium salts photolysis

Pyridinium salts pyridone formation

Pyridinium salts reaction with Grignard reagents

Pyridinium salts reactions with alkyl radicals

Pyridinium salts reduction with dithionite

Pyridinium salts regioselectivity

Pyridinium salts structure

Pyridinium salts, 1,3-dimethylreduction

Pyridinium salts, 1,3-dimethylreduction borohydrides

Pyridinium salts, 2-acyl-, oxidation

Pyridinium salts, 2-acyloxyacylation

Pyridinium salts, 2-acyloxyacylation alcohols

Pyridinium salts, 2-acylthio-N-alkylacylating agents

Pyridinium salts, 2-halocarbothioate synthesis

Pyridinium salts, 4-nitroarylelectroreduction

Pyridinium salts, 5,6-dihydroreactions with organometallic compounds

Pyridinium salts, acyl

Pyridinium salts, alkoxy

Pyridinium salts, azoarene substitution reactions

Pyridinium salts, benzylic

Pyridinium salts, charge-transfer

Pyridinium salts, charge-transfer donors

Pyridinium salts, photoinduced

Pyridinium salts, reaction with

Pyridinium salts, rearrangement

Pyridinium salts, reduction

Pyridinium, 1-sulfo-, hydroxide, inner salt

Pyridones from pyridinium salts

Pyridyl pyridinium salts

Quaternary pyridinium salts

Quaternary pyridinium salts, reduction

Sodium borohydride pyridinium salts

Subject pyridinium salts

Synthesis of Quinolizinium and Pyridinium Salts

Thiazolo(2,3-/»]pyridinium salts

Zincke reaction, pyridinium salts

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