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Oxidizing group

The commonly used commercial lead-based PVC stabilizers rely on one or more lead(II) oxide groups bound to the primary bivalent lead salt. [Pg.551]

Substitution Reactions. Aromatic heterocycHc A/-oxides undergo both electrophilic and nucleophilic substitution because the dipolar N-oxide group is both an electron donor and an electron acceptor, giving rise to the resonance stmctures ... [Pg.191]

Nucleophilic substitution occurs in positions a and y to the N-oxide group. In nearly all these reactions deoxygenation occurs giving the substituted heterocychc amine. [Pg.191]

Number of ethylene oxide groups in esterified polyoxyethylene (POE). See Table 1. [Pg.250]

Polyurethane foams are formed by reaction with glycerol with poly(propylene oxide), sometimes capped with poly(ethylene oxide) groups with a reaction product of trimethylolpropane and propylene oxide or with other appropriate polyols. A typical reaction sequence is shown below, in which HO—R—OH represents the diol. If a triol is used, a cross-linked product is obtained. [Pg.190]

Although connection of polyalkylene or poly(alkylene oxide) groups to the polyamine is most commonly by the succinimide linkage, a different linking group is employed in another important class of ashless dispersants— the Mannich bases. They are prepared on a commercial scale by reaction of an alkylphenol with formaldehyde and a polyamine (173—177). The alkyl and polyamine moieties are similar to those used in the succinimide products. [Pg.47]

When nitration of pyridazine iV-oxides is carried out with acyl nitrates (prepared in situ from acyl chlorides and silver nitrate) the reaction takes place at the /3-position relative to the iV-oxide group. Under these circumstances only mononitro derivatives are formed. For example, nitration of pyridazine 1-oxide with acetyl nitrate yields 3-nitropyridazine 1-oxide (17%) and 5-nitropyridazine 1-oxide (0.8%), whereas with benzoyl nitrate a better yield of 5-nitropyridazine 1-oxide is obtained. [Pg.21]

Pyridazine 1-oxides substituted at position 3 or positions 3 and 6 afford the corresponding 5-nitro derivatives. A methyl group at position 6 (a with respect to the iV-oxide group) is frequently converted into the cyano group, and a methoxy group at position 6 is demethy-lated by benzoyl chloride/silver nitrate. For example, 3-substituted 6-methylpyridazine 1-oxides give the 5-nitro derivatives (96) and the 6-cyano-5-nitro derivatives (97), whereas... [Pg.21]

Mannich reaction with pyridazinone 1-oxides takes place at the a- or y-positions relative to the iV-oxide group, in contrast to the reaction in the pyridazinone series, where N-substituted products are formed. Pyridazin-3(2FT)-one 1-oxide gives first the corresponding 6-substituted derivative with excess of the reagents, 4,6-disubstituted products are obtained. When position 6 is blocked the corresponding 4-dialkylaminomethyl derivatives are obtained. [Pg.21]

Treatment of pyridazine 1-oxides with phosphorus oxychloride results in a-chlorination with respect to the N-oxide group, with simultaneous deoxygenation. When the a-position is blocked, substitution occurs at the y-position. 3-Methoxypyridazine 1-oxide, for example, is converted into 6-chloro-3-methoxypyridazine and 3,6-dimethylpyridazine 1-oxide into 4-chloro-3,6-dimethylpyridazine. [Pg.23]

When alkoxypyridazine 1-oxides are heated alone or in the presence of p-toluenesulfonic acid the methyl group migrates from the methoxy group to the A-oxide group. In this manner, 4-methoxypyridazine 1-oxide rearranges to l-methoxypyridazin-4(l//)-one, 5-methoxypyridazine 1-oxide to 2-methylpyridazin-5(2//)-one 1-oxide and substituted 3,6-dimethoxypyridazine 1-oxides to l,3-dimethoxypyridazin-6(l//)-ones. [Pg.36]

In those reactions where the fV-oxide group assists electrophilic or nucleophilic substitution reactions, and is not lost during the reaction, it is readily removed by a variety of reductive procedures and thus facilitates the synthesis of substituted derivatives of pyrazine, quinoxaline and phenazine. [Pg.172]

Removal of AT-oxide groups by PCI3 follows normal behaviour (63JCS6073), but with acetic anhydride the AAoxides (332) underwent a complex ring-opening reaction leading to (333), and an isomeric 8-alkoxy-6-oxide behaved similarly (75H(3)38l). [Pg.241]

AT-Oxidation is very sensitive to steric effects, since 1-substituted lumazines and pterins give only 5-oxides and the presence of bulky substituents at position 7 also directs oxidation to N-5. The pteridine 5-oxide (52) and 8-oxide (53) and the 5,8-dioxide (55) contain the AT-oxide groups as such, even when the possibility of AT-hydroxy tautomers exists, as in (53) i(54). [Pg.281]

A useful approach to the substitution of ring C—H positions lies in the activation of the heteroaromatic system by an A-oxide group, initiating a formal intramolecular redox reaction. 1-Methyllumazine 5-oxide reacts with acetic anhydride in a Katada rearrangement... [Pg.289]

The reactivity of these compounds is somewhat similar to that of the azolonium ions, particularly when the cationic species is involved. However, although the typical reaction is with nucleophiles, the intermediate (20) can lose the iV-oxide group to give the simple a-substituted azole (21). Benzimidazole 3-oxides are readily converted into 2-chloroben-... [Pg.43]

Azole 7V-oxide groups are readily removed by reduction with Zn/HOAc, HI or PCI3, e.g. in the pyrazole series. 1,2,3-Thiadiazole 3-oxides isomerize on irradiation to the corresponding 2-oxides. [Pg.110]

Enby 6 is an example of a stereospecific elimination reaction of an alkyl halide in which the transition state requires die proton and bromide ion that are lost to be in an anti orientation with respect to each odier. The diastereomeric threo- and e/ytAra-l-bromo-1,2-diphenyl-propanes undergo )3-elimination to produce stereoisomeric products. Enby 7 is an example of a pyrolytic elimination requiring a syn orientation of die proton that is removed and the nitrogen atom of the amine oxide group. The elimination proceeds through a cyclic transition state in which the proton is transferred to die oxygen of die amine oxide group. [Pg.100]

There is also for the quinidine ether oxide group (formula C) an im-expected third isomeride, possibly due to epimerisation about carbon atoms 9 and 10. These quinidine isomerides are no doubt convertible... [Pg.450]

The A-oxide group is more strongly activating in nucleophilic substitution than the aza group itself because of the increased contribution of the polarized structure 38. ... [Pg.324]

It is useful to compare the spectroscopic data of 1,2,4-triazine mono-A-oxides with the data for the corresponding 1,2,4-triazines. Introduction of an A-oxide group in the 1,2,4-triazine ring changes its physicochemical properties dramatically, and the analysis of these changes allows one to determine which of three nitrogens is oxidized. The most useful method in this case is NMR spectroscopy, including H, C, and N NMR. [Pg.262]


See other pages where Oxidizing group is mentioned: [Pg.2574]    [Pg.2578]    [Pg.552]    [Pg.27]    [Pg.182]    [Pg.232]    [Pg.249]    [Pg.255]    [Pg.161]    [Pg.529]    [Pg.19]    [Pg.20]    [Pg.23]    [Pg.24]    [Pg.172]    [Pg.690]    [Pg.132]    [Pg.132]    [Pg.285]    [Pg.324]    [Pg.137]    [Pg.359]    [Pg.217]    [Pg.260]    [Pg.261]   
See also in sourсe #XX -- [ Pg.208 ]

See also in sourсe #XX -- [ Pg.160 ]




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Aldehydes by oxidation at methyl groups

Aldehydes by oxidation of methyl group

Alkaline earth (group oxidation number

Alkaline earth and group IV oxides

Alkyl group oxidative addition

Alkyl groups oxidation

Alkyl- diphenylphosphine oxides group

Aluminum oxide surface hydroxyl groups

Amino acids methyl group oxidation

Amino group oxidative coupling reactions

Amphoteric oxides and hydroxides group

Angular methyl group oxidation

Arenes phenyl group oxidation

Aromatic alkyl groups, oxidation

Aromatic polyethers having phosphine oxide groups

Basicity Carbonate, oxide group

Biochemical oxidations groups

By oxidation of methyl groups

Carbonyl group oxidation and reduction

Carbonyl groups, by oxidation

Carboxylic methyl groups), oxidation

Cellulose oxidized groups

Complex groups, oxides

Differentiation of hydroperoxide groups by reactions with nitric oxide

Difluoromethyl group oxidation

Directing groups oxidants

Easily oxidized phenyl group

Electrolytic oxidations groups

Enzymatic oxidation of the phenolic hydroxyl group

Ethylene oxide groups

Ethylene oxide with carboxyl groups

F Induced Oxidative Cleavage of Phenyldimethylsilyl Groups

Functional Group Oxidation Reactions

Functional Group Sensitivity to Jones Oxidation

Functional Group Transformations Oxidation and reduction

Functional groups oxidation level

Functional groups oxidation state

Functional groups oxidative conversions

GROUP SIX TRIATOMIC OXIDES

Graphite, surface groups oxides

Group 10 metal-promoted oxidations catalytic oxidative carbonylation

Group 11 metal-promoted oxidations oxidative biaryl coupling

Group 14 amides oxidative addition/redox

Group 15 cont oxides

Group 16 elements binary oxides

Group 16 elements sulfur oxides

Group 2 elements oxide deposition

Group 2 elements oxides

Group 2 low-valent oxides and nitrides

Group 2 oxides reaction with, phosgene

Group 4 metal-promoted oxidations asymmetric oxidation of sulfides

Group 4 oxide halides

Group 4 oxide halides reaction with, phosgene

Group 5 elements oxidation states

Group 5 metal halide clusters oxidation states

Group 5 metal-promoted oxidations epoxidations using vanadyl acetylacetonate

Group 7 metal-promoted oxidations epoxidation by salen manganese complexes

Group 8 , endogenous nitric oxide

Group 8 metal-promoted oxidations alkene cleavage and asymmetric dihydroxylation

Group 9 metal-promoted oxidations aerobic epoxidation of alkenes

Group II oxides

Group V metal oxides

Group VIA oxides

Group VIII metals, oxidation with

Group amphoteric oxides

Group oxidation number

Group oxidation states

Group oxides

Group oxides

Group trends oxidation states

Groups N-oxide

Guaiacyl groups, oxidation

High Oxidation State Anion Group (

Hydroperoxide groups oxide)

Hydroxy group, oxidation

Hydroxyl groups on oxide surfaces

Hydroxyl groups, furans oxidation with

Hydroxymethyl group, oxidation

Insoluble Oxide Group (

Iron group oxides

Jones oxidation functional group sensitivity

Jones oxidation protecting group sensitivity

Leaving group effect phosphine oxides

Leaving group effect pyridine oxides

MAIN GROUP OXIDES AND SULFIDES

Macroporous Oxides of Group 4 Elements (Ti,Zr)

Main group element oxide ceramics

Main group element oxides

Main group element oxides reactions with transition metal complexes

Main group oxides

Main-group elements oxidation states/numbers

Main-group metal oxides and nitrides

Main-group oxide fluorides

Melting points group 2 metal oxides

Melting points group 2 oxides

Mesoporous Oxides of Group 4 Elements (Ti, Zr)

Metabolites Formed by Oxidative Coupling of Galloyl Esters Groups 2B and 2C, Ellagitannins

Methyl group oxidation pathways

Methyl group, oxidation

Methyl group, oxidation carbonyl

Methylene groups ketones, oxidation, allylic

Methylene groups oxidation

Methylene groups, activated periodate oxidation

Methylene groups, nitrosation oxidation

Motion oxidized functional group

N-Formyl groups, protective removal, oxidative

Nitric oxide synthase prosthetic groups

Nitrogen groups oxidative cleavage

Organic functional groups relative oxidation states

Oxidable groups

Oxidation Group VIII metals

Oxidation States and EMFs of Groups

Oxidation States of Alcohols and Related Functional Groups

Oxidation functional group

Oxidation group

Oxidation leaving group generation

Oxidation methyl group, chromic acid

Oxidation number of reactive main-group elements

Oxidation of Aldehydes to Amides, Esters and Related Functional Groups

Oxidation of Hydroxyl Groups

Oxidation of active methylene groups

Oxidation of alkanes, alkenes and alkyl groups

Oxidation of aromatic methyl groups

Oxidation of sulfur groups

Oxidation of the methyl group

Oxidation of the phenolic hydroxyl group

Oxidation of vinyl group

Oxidation potential, functional group

Oxidation reactions migrating group mechanism

Oxidation states group 4 metals

Oxidation unsaturated groups

Oxidation, by air group

Oxidation, by nitric acid of aldehyde to carboxyl group

Oxidation, by nitric acid of hydroxyl to carboxyl group

Oxidation, of alkyl groups

Oxidation, oxazole reactions activating group

Oxidations hydroxyl groups

Oxidations of Individual OH Groups

Oxidative addition leaving group reactivity order

Oxidative aging groups

Oxidative phenylsulfonyl groups

Oxide surface hydroxyl groups

Oxides Group IIIA elements

Oxides group 14 metals

Oxides iron group oxide

Oxides of Group 1 elements

Oxides of Group 2A metals

Oxides of Other Groups

Oxides of group

Oxides of the Group IVA Elements

Oxidized Groups in Cellulose

Oxidized starches carboxylic groups

Oxidizing agents group 16 oxides and oxoacids

Oxidizing agents group 2 peroxides

Oxime group, oxidative cyclization

Periodate oxidation active methylene groups

Periodate oxidation groups

Peroxynitrite thiol group oxidation

Plasma membrane thiol group oxidation

Platinum group oxides

Platinum-group metals oxide-film formation

Platinum-group metals oxides

Preparations and Reactions of Inorganic Main-Group Oxide Fluorides

Protecting Group Sensitivity to Jones Oxidation

Protecting groups oxidation-labile

Protective groups, removal oxidative

Rare earth oxide elements cerium group

Rare earth oxide elements yttrium group

Reaction oxide-supported group VIII metal

Reactions at the Carbonyl Group—Oxidation and Reduction

Reactions of phosgene with Group 1 oxides and sulfides

Reactions of phosgene with Group 16 oxides

Reduction of Main Group Oxides via Metal Carbonyls and Carbonylate Anions

Reductions of Heterocyclic N-Oxides and Aromatic Nitro Groups

Replacement, benzenesulfonate groups oxide oxygen atom by sulfur

SH groups oxidation

Selective Oxidation of Hydroxymethyl Groups

Selective Oxidation of the Primary Hydroxyl Group

Selective Oxidative Cleavages at Other Functional Groups

Selenium dioxide, oxidation methyl group

Spectra of Adsorbed Water and Surface Hydroxyl Groups on Nonacidic Oxides

Spin-lattice relaxation oxidized functional groups

Substrate studies functional group oxidation

Sulfur groups oxidative cleavage

Surface functional group oxide

The Oxidation of Primary Hydroxyl Groups

The Oxidation of Secondary Hydroxyl Groups

The Polyaddition of Alkylene Oxides to Hydroxyl Groups

Thermal degradation/oxidation groups

Thiol-groups from oxidation

Transition group oxides

Transition metal oxides iron group oxide

Unsaturated groups oxidations, bioactivation

Unsaturated groups oxidative attack

Vinyl group, oxidation

Vinyl group, oxidation carboxyl

Zinc group oxides, stabilities

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