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Pyridines oxidative

Pyridine oxide [694-59-7] is converted to 4-nitropyridine oxide in 80—90% yield on heating with concentrated sulfuric acid and filming nitric acid at 100°C (38). [Pg.191]

The major product of this reaction is the yellow, labile, 1 2 molar adduct (134) corresponding to the pyridine series, along with a small amount of a colorless compound (139) which is discussed later and some phenanthridine oxalate. The labile adduct is converted to the stable isomer (135) on heating in quinoline or pyridine. Oxidation of both these adducts with potassium permanganate in acetone gives phenanthridone as the major product. In the case of the labile adduct. [Pg.160]

Pyridine 1-oxide, like pyridine, can act as a ligand in transition metal complexes, but unfortunately good stability constants are not known. However, Shupack and Orchin have found that the C===C stretching frequency of the ethylene ligand in trans-ethylene pyridine 1-oxide dichloroplatinum(II) varies linearly with the pA and hence with the C7-value (ct+ or a, respectively) of substituents in the pyridine oxide. The data for the above reaction series are included in Table V. [Pg.236]

Oxazepine-2,4-dicarbonitrile (lb) and 6-methyl-l,3-oxazepine-2,4-dicarbonitrile (lc) are obtained from the corresponding pyridine oxides 9 both oxazepines decompose on attempted chromatography. [Pg.302]

Purex process, 6,940 Barium, pentakis(diacetamide)-stereochemistry, 1, 99 Barium alkoxides synthesis, 2,336 Barium complexes cryptands, 3,53 phthalocyanines, 2, 863 porphyrins, 2,820 pyridine oxide, 3,9 urea, 3,9... [Pg.89]

Calcium-binding proteins, 6, 564, 572, 596 intestinal, 6, 576 structure, 6, 573 Calcium carbonate calcium deposition as, 6, 597 Calcium complexes acetylacetone, 2, 372 amides, 2,164 amino acids, 3, 33 arsine oxides, 3, 9 biology, 6, 549 bipyridyl, 3, 13 crown ethers, 3, 39 dimethylphthalate, 3, 16 enzyme stabilization, 6, 549 hydrates, 3, 7 ionophores, 3, 66 malonic acid, 2, 444 peptides, 3, 33 phosphines, 3, 9 phthalocyanines, 2,863 porphyrins, 2, 820 proteins, 2, 770 pyridine oxide, 3,9 Schiff bases, 3, 29 urea, 3, 9... [Pg.97]

Strontium, aquatetrakis(diacetamide)-structure, 1,98 Strontium, heptaaqua-dodecaiodide structure, 1, 72 Strontium, octaaqua-structure, 1, 84 Strontium alkoxides synthesis, 2,336 Strontium complexes porphyrins, 2, 820 pyridine oxide, 3, 9 Structure... [Pg.226]

Prostaglandins 624, 725, 960 Prostanoids 620 Protonation 565-567, 1049 photochemical 882 Pseudopotential methods 15, 16 Pummerer rearrangement 240, 243, 470, 843 Pyramidal inversion 602, 604 Pyrazolenines 749 Pyridazine oxides 640 Pyridine aldehydes, synthesis of 310 Pyridine oxides 640 Pyrolysis 102-105 of sulphones 110, 679-682, 962 of sulphoxides 739, 740 Pyrroles 265, 744... [Pg.1203]

Ring contractions of pyran derivatives are occasionally valuable. The contraction of 3-halo-2-pyrones to 2-furoic acids under the influence of alkali has been studied and the conditions defined.58112113 The method is adaptable to the preparation of 3-furoic acid via furan-2,4-dicarboxylic acid58 and of 3,4,5-triphenylfuran-2-carboxylic acid.113 Another ring contraction involving halides is the conversion of 4-chloromethylpyrylium salts into furylmethyl ketones as indicated in Scheme 21.114 Pyridine oxides may be transformed with unexpected ease into furans through treatment with a thiol (Scheme 22).115... [Pg.189]

The structural relationship among the above alkaloids was indicated by catalytic hydrogenation of 50, followed by mild Cr03-pyridine oxidation. This led to a mixture containing 44 as the major product and 45. The main work on structure elucidation was performed on 50, and this involved an interesting combination of chemical degradation and spectroscopy. [Pg.79]

Intramolecular Lewis base complexation of the germanium atom also did not appear to be a valuable alternative to overcome the lability of these elusive intermediates, since the germanones expected from oxidation of the base-stabilized germylenes 140131 (with Me3NO) and 141132 (with 02, DMSO, or pyridine oxide) either rearrange as already mentioned [Section VI,A,4, Eq. (33)]131 or dimerize to digermadioxetane 160132 [Eq. (35)]. [Pg.152]

Also, attempts to convert phosphine to PH3O using amine oxides, such as trimethylamine oxide and pyridine oxide, did not proceed to the result formulated in Eq. (19)... [Pg.24]

Phosphine reacts neither in aqueous solution nor direct with trimethylamine oxide. Also no reaction occurs on treatment of phosphine with pyridine oxide... [Pg.24]

X0 complexes, 37 272-282 phosphine complexes, 37 271-274 phosphite complexes, 37 272, 274 prophyrin and phthalocyanine complexes, 37 251-253 pyridine oxide complexes, 37 284 2-pyridinethiolato, 2-pyrimidinethiolato, and thiopyrine complexes, 37 295-296... [Pg.220]


See other pages where Pyridines oxidative is mentioned: [Pg.1081]    [Pg.509]    [Pg.650]    [Pg.2920]    [Pg.91]    [Pg.454]    [Pg.454]    [Pg.454]    [Pg.454]    [Pg.829]    [Pg.662]    [Pg.285]    [Pg.385]    [Pg.220]    [Pg.172]    [Pg.94]    [Pg.96]    [Pg.113]    [Pg.115]    [Pg.155]    [Pg.155]    [Pg.158]    [Pg.160]    [Pg.160]    [Pg.162]    [Pg.162]    [Pg.188]    [Pg.199]    [Pg.235]    [Pg.236]    [Pg.249]    [Pg.251]    [Pg.18]    [Pg.80]    [Pg.83]    [Pg.127]    [Pg.344]    [Pg.282]    [Pg.25]    [Pg.252]    [Pg.165]   


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1.2.4- Triazolo pyridine 3-oxides

1.3- Diphenyl pyridine one-electron anodic oxidation

2- Pyridylamidines, oxidative cyclisations l,2,4]triazolo pyridines

2- imidazole pyridines, oxidative

2- pyridine, oxidative cyclisation

4- pyridine 1-oxides tautomerism

5.5- dichloro pyridine 1-oxide

Alkyl pyridines anodic oxidation

Barium complexes pyridine oxide

Boron complexes pyridine oxide

Cadmium complexes pyridine oxide

Calcium complexes pyridine oxide

Chiral pyridine N-oxides

Chromic oxide complexes with pyridine

Chromium oxide, addition compounds with pyridine and 3and 4-picoline

Chromium oxide, copper trioxide-pyridine

Chromium oxide-pyridine, oxidation with

Chromium trioxide-pyridine complex oxidant

Chromophores pyridine-77-oxide

Copper complexes pyridine oxide

Cryptands pyridine oxide

Cyanopyridines from pyridine 1-oxides

Grignard reagents with pyridine oxides

Hammett equation pyridine 1-oxides

Heteroaromatic oxidation pyridine

Hydrogen-Bonded Pyridine N-Oxides

Hydroxylations with pyridine oxide

Imidazo pyridine 4-oxide, nitration

Indoles coupling with pyridine //-oxides

Iron chloride oxide , intercalate with pyridine

Lanthanide complexes pyridine oxides

Lead acetate, alcohol oxidations, pyridine

Leaving group effect pyridine oxides

Magnesium complexes pyridine oxide

Manganese complexes pyridine oxides

Mercury complexes pyridine oxide

Nitration of pyridine A-oxides

Nitration of pyridine-N-oxide

Nucleophilic substitution—continued of pyridine N-oxides, kinetics for

Of pyridine oxides

Osmium tetroxide-Trimethylamine N-oxide-Pyridine

Oxidation of pyridines

Oxidation pyridines

Oxidation with Chromium Trioxide-Pyridine Complex

Oxidation-reduction potentials of pyridine nucleotide system

Oxidations dimethyl sulfoxide-sulfur trioxide/pyridine

Oxidations sulfur trioxide-pyridine

Oxidative activation pyridine exchange reactions

Oxidative cyclizations 2- imidazole pyridines

Palladium complexes pyridine oxides

Phenyl pyridine N-oxide

Pyridin N-oxide

Pyridin-l-oxid

Pyridine .iV-oxide

Pyridine 1 -oxide—continued reactions

Pyridine 1 -oxide—continued reactions with

Pyridine 1 -oxide—continued substitution reactions

Pyridine 1-oxide

Pyridine 1-oxide 3- hydroxy-, methylation

Pyridine 1-oxide arylation

Pyridine 1-oxide formation

Pyridine 1-oxide halogenations

Pyridine 1-oxide irradiation

Pyridine 1-oxide mass spectra

Pyridine 1-oxide mercuration

Pyridine 1-oxide metalation

Pyridine 1-oxide metallation

Pyridine 1-oxide nitration

Pyridine 1-oxide nucleophilic reactions

Pyridine 1-oxide reaction with acetic anhydride

Pyridine 1-oxide reaction with phosphorus oxychloride

Pyridine 1-oxide reaction with sodium acetylide

Pyridine 1-oxide reactivity

Pyridine 1-oxide reduction

Pyridine 1-oxide ring expansion

Pyridine 1-oxide sulfonation

Pyridine 1-oxide thioalkylation

Pyridine 1-oxide, 2,3,4,5-tetrahydro

Pyridine 1-oxide, 2-methyl-, reaction with

Pyridine 1-oxide, 2-methyl-, reaction with Grignard

Pyridine 1-oxide, 3,5-dimethyl

Pyridine 1-oxide, 4-chloro-, amination

Pyridine 1-oxide, 4-dimethylamino

Pyridine 1-oxide, nucleophile

Pyridine 1-oxides acetamido

Pyridine 1-oxides acid-catalyzed

Pyridine 1-oxides amino

Pyridine 1-oxides base-catalyzed

Pyridine 1-oxides bromination

Pyridine 1-oxides electrophilic

Pyridine 1-oxides free-radical

Pyridine 1-oxides halogenation

Pyridine 1-oxides hydrogen exchange

Pyridine 1-oxides hydroxy

Pyridine 1-oxides lithiation

Pyridine 1-oxides mercapto

Pyridine 1-oxides mercuriation

Pyridine 1-oxides nucleophilic

Pyridine 1-oxides substitution

Pyridine 1-oxides, basicities

Pyridine 1-oxides, basicities nucleophilic substitution

Pyridine 1-oxides, phenyl-, nitration

Pyridine 1-oxides—continued

Pyridine 1-oxides—continued reactivity

Pyridine 1-oxides—continued reduction

Pyridine 7V-Oxides

Pyridine A-oxidation

Pyridine A-oxides and pyridinium Salts

Pyridine Al-oxides

Pyridine JV-oxide

Pyridine N-oxidation

Pyridine N-oxide complexes

Pyridine N-oxide ring

Pyridine N-oxide, from

Pyridine N-oxides reduction

Pyridine N-oxides, 2-acylthiosynthesis

Pyridine N-oxides, substituted

Pyridine TV-oxides

Pyridine W-oxides

Pyridine dicarboxylates oxidation

Pyridine homologues, oxidation

Pyridine iV-oxidation

Pyridine lV-oxide

Pyridine nucleotides oxidation

Pyridine oxide complexes

Pyridine oxide complexes, osmium

Pyridine oxide, oxidant

Pyridine oxide, oxidant

Pyridine, 1-oxide, compd. with tantalum

Pyridine, 2- 1-oxide metal complexes

Pyridine, 2-mercaptoN-oxide

Pyridine, 2-mercaptoN-oxide O-acyl thiohydroxamates from

Pyridine, 2-nitrososynthesis via oxidation of sulfimides

Pyridine, 4-methoxy-1-oxide

Pyridine, 4-nitroaromatic nucleophilic substitution N-oxide

Pyridine, 6-methyl-2,3,4,5-tetrahydroN-oxide

Pyridine, 6-methyl-2,3,4,5-tetrahydroN-oxide reaction with allylmagnesium bromide

Pyridine, adsorption metal oxides

Pyridine, methylmicrobial oxidation

Pyridine-1 -oxides rearrangement

Pyridine-A-oxides

Pyridine-Chromium(VI) Oxide

Pyridine-M-oxides

Pyridine-N-oxide

Pyridine-V-oxide

Pyridine-chromium oxide

Pyridines V-oxidation

Pyridines oxidations, methyltrioxorhenium

Pyridines oxidative process

Pyridines, 1-oxides—continued sodium

Pyridinium Compounds, Ylides, Pyridine N-Oxides

Pyridyl pyridine 1-oxides

Reduction of pyridine N-oxides

Sarett oxidation chromium oxide/pyridine complex

Silica supported oxides, pyridine adsorption

Solvatochromism pyridine-1 -oxide

Subject pyridine oxides

The Chemical Mechanism of Pyridine N-oxide Reduction

Thorium complexes pyridine oxide

Vinyl pyridine N-oxide

Zirconium complexes pyridine oxide

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