Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Phenol, oxidation

The cycloaddition of alkynes and alkenes to nitrile oxides has been used in the synthesis of functionalised azepine systems <96JHC259>, <96T5739>. The concomitantly formed isoxazole (dihydroisoxazole) ring is cleaved by reduction in the usual way. Other routes to 1-benzazepines include intramolecular amidoalkylation <96SC2241> and intramolecular palladium-catalysed aryl amination and aryl amidation <96T7525>. Spiro-substituted 2-benzazepines have been prepared by phenolic oxidation (Scheme 5) <96JOC5857> and the same method has been applied to the synthesis of dibenzazepines <96CC1481>. [Pg.321]

Hopkins GD, J Munakata, L Semprini, PL McCarty (1993a) Trichloroethylene concentration effects on pilot-scale in-situ groundwater bioremediation by phenol-oxidizing microorganisms. Environ Sci Technol 27 2542-2547. [Pg.688]

Hopkins GD, L Semprini, PL McCarty (1993b) Microcosm and in situ field studies of enhanced biotransformation of trichloroethylene by phenol-oxidizing microorganisms. Appl Environ Microbiol 59 2277-2285. [Pg.688]

These experiments clearly showed that it is a-oxygen participation that provides FeZSM-5 zeolites with such a remarkable catalytic performance in the reaction of benzene to phenol oxidation. Equations (1-3) written above are the main stages of the reaction mechanism. [Pg.497]

The nitrosophenol (10), which may be isolated, is oxidised very rapidly by nitric acid to yield the p-nitrophenol (11) and nitrous acid more nitrous acid is produced thereby and the process is progressively speeded up. No nitrous acid need be present initially in the nitric acid for a little of the latter attacks phenol oxidatively to yield HN02. The rate-determining step is again believed to be the formation of the intermediate (9). Some direct nitration of such reactive aromatic compounds by N02 also takes place simultaneously, the relative amount by the two routes depending on the conditions. [Pg.138]

At alkaline conditions (pH=l 1) no phenol, hydroquinone were detected. This is possibly due to the fact that the rate of phenol oxidation increases under alkaline conditions with optimum pH between 9.5 and 13 [17] and so once it is formed, it is readily oxidised. The absence of phenol and increased concentration of p-hydroxybenzoic acid could be also explained by reduced decarboxylation rates under conditions of high pH, which would result in the oxidation of p-hydroxybenzaldehyde to form p-hydroxybenzoic acid. [Pg.314]

The phenanthrene 1,2- and 3,4-diones are synthetically accessible from the related 8 phenols. Oxidation of 2-phenanthrol with either Fremy s salt ((KS0 )2N0) or phenylseleninic anhydride gave phenanthrene 1,2-dione directly (55). Unexpectedly, oxidation of 3-phenanthrol with (KSOg NO yielded 2,2-dihydroxybenz(e)indan-l,3-d-ione (Figure 10). However, phenanthrene 3,4-dione was readily obtained from 3-phenanthrol by Fieser s method entailing diazonium coupling, reduction, and oxidation of the resulting 4-amino-3-phen-anthrol with chromic acid (56). [Pg.51]

The monophenolase activity of PPO is generally defined as the first step in the melaniza-tion pathway and consists of the o-hydroxylation of the monophenol to odiphenol. This activity distinguishes PPO from other phenol-oxidizing enzymes, such as laccase and peroxidase, and is characterized by the following facts ... [Pg.107]

Zilly A, de Souza CGM, Barbosa-Tessmann IP, Peralta RM (2002) Decolourisation of industrial dyes by a Brazilian strain of Pleurotus pulmonarius producing laccase as the sole phenol-oxidizing enzyme. Folia Microbiol 47 315-319... [Pg.166]

Consequently, in an inert atmosphere/= 2(1 + k(lls/krcc) > 2. When phenoxyl radicals react only with peroxyl radicals, /= 2 and there is no regeneration. At low dioxygen pressures, phenoxyl radicals react with both peroxyl and alkyl radicals / ranges between 2 and 2(1 +kdis/krec) and increases with decreasing p02- In addition to this, the product of phenol oxidation, quinone, becomes the efficient alkyl radical acceptor at low dioxygen pressure (see earlier). [Pg.679]

Phenol oxidation over TS-1 in H2O and methanol mixture solvent... [Pg.144]

Vargaftik, M.N. et al., Catalysis with a Pd giant cluster phenol oxidative carbonylation to diphenul carbonate conjugated with reductive nitrobenzene conversion, J. Mol. Catal. A Chem., 108, 77, 1996. [Pg.88]

Subrahmanyam VV, O Brien PJ. 1985. Phenol oxidation products, formed by a peroxidase reaction, that bind to DNA. Xenobiotica 15 873-885. [Pg.228]

Incorporation studies have clarified the relative importance of the two routes that lead to the catechol metabolite of phenytoin, namely phenol oxidation and dihydrodiol dehydrogenation (Fig. 10.8, Reactions e and/, respectively) [80], Indeed, upon incubation of phenytoin in an 1802 atmosphere, two atoms of 180 are incorporated into the catechol when formed via phenol oxidation, but only one when formed via dihydrodiol dehydrogenation. This elegant study showed quite clearly that most of the catechol (75 10%) came from the phenol, indicating a comparatively slow dehydrogenation of the dihydrodiol. [Pg.622]

Para-Xylene Oxidation (wt.%) Phenol Oxidation (wt.%) TBHP Conv. (TOF,h ) H2O2 Conv. (TOF,h )... [Pg.212]

Diarylamides with arenes activated by electron-donating substituents can be converted to azacycles by anodic oxidation through phenolic oxidative coupling reactions that can be a key step in the synthesis of alkaloids (Schemes 16 and 17). According to the nature of substituents and the experimental conditions, either spiro compounds [22] or non-spiro compounds [23, 24] were obtained. [Pg.346]

Enzymatic browning. Phenol-oxidizing enzymes (such as tyrosinase and peroxidase) oxidize tyrosine residues into reactive quinone derivatives, which will condense into colored polymers (melanins). Melanins are rich in carboxyl groups and therefore have high affinity for divalent metal ions such as calcium. [Pg.35]


See other pages where Phenol, oxidation is mentioned: [Pg.1012]    [Pg.369]    [Pg.522]    [Pg.271]    [Pg.1012]    [Pg.97]    [Pg.41]    [Pg.100]    [Pg.307]    [Pg.335]    [Pg.339]    [Pg.339]    [Pg.34]    [Pg.115]    [Pg.291]    [Pg.129]    [Pg.352]    [Pg.589]    [Pg.417]    [Pg.57]    [Pg.125]    [Pg.154]    [Pg.348]    [Pg.380]    [Pg.405]    [Pg.9]    [Pg.87]    [Pg.122]   
See also in sourсe #XX -- [ Pg.1012 , Pg.1013 , Pg.1018 ]

See also in sourсe #XX -- [ Pg.1012 , Pg.1013 , Pg.1018 ]

See also in sourсe #XX -- [ Pg.100 ]

See also in sourсe #XX -- [ Pg.233 ]

See also in sourсe #XX -- [ Pg.334 ]

See also in sourсe #XX -- [ Pg.101 ]

See also in sourсe #XX -- [ Pg.334 ]

See also in sourсe #XX -- [ Pg.405 ]

See also in sourсe #XX -- [ Pg.334 ]

See also in sourсe #XX -- [ Pg.334 ]

See also in sourсe #XX -- [ Pg.1012 , Pg.1014 , Pg.1018 ]

See also in sourсe #XX -- [ Pg.310 ]

See also in sourсe #XX -- [ Pg.157 , Pg.160 ]

See also in sourсe #XX -- [ Pg.233 ]

See also in sourсe #XX -- [ Pg.101 ]

See also in sourсe #XX -- [ Pg.544 , Pg.570 ]

See also in sourсe #XX -- [ Pg.631 ]

See also in sourсe #XX -- [ Pg.210 , Pg.210 , Pg.266 ]

See also in sourсe #XX -- [ Pg.368 , Pg.369 , Pg.370 , Pg.373 , Pg.376 , Pg.379 , Pg.402 ]

See also in sourсe #XX -- [ Pg.332 ]

See also in sourсe #XX -- [ Pg.620 ]

See also in sourсe #XX -- [ Pg.1008 , Pg.1013 ]

See also in sourсe #XX -- [ Pg.593 ]

See also in sourсe #XX -- [ Pg.214 , Pg.236 , Pg.239 , Pg.241 ]

See also in sourсe #XX -- [ Pg.114 , Pg.125 ]

See also in sourсe #XX -- [ Pg.206 ]

See also in sourсe #XX -- [ Pg.177 , Pg.178 , Pg.179 , Pg.180 , Pg.181 ]

See also in sourсe #XX -- [ Pg.262 ]

See also in sourсe #XX -- [ Pg.79 , Pg.83 ]

See also in sourсe #XX -- [ Pg.932 , Pg.937 ]

See also in sourсe #XX -- [ Pg.523 ]

See also in sourсe #XX -- [ Pg.10 ]

See also in sourсe #XX -- [ Pg.653 ]

See also in sourсe #XX -- [ Pg.94 , Pg.127 ]




SEARCH



2- -phenol oxidative cyclization

ADLER Phenol Oxidation

Allyl phenols, oxidation

Amaryllidaceae alkaloids phenol oxidative coupling

Auto-oxidation of phenolic compounds

Base-catalyzed oxidation of substituted phenols

Benzene Oxidation to Phenol Making Phenolic Resins for Building

Benzene, oxidation to phenol

Boron compounds, aromatic oxidation to phenols

Catalytic oxidation of phenols

Chloric acid, oxidation phenols

Chromic acid oxidation of phenols

Chromic acid oxidation phenols

Cobalt catalysis phenol oxidation

Copper oxidative phenol coupling

Coupling reactions phenolic oxidative

DAKIN Phenol Oxidation

Dihydric phenols, oxidation

Direct Oxidation of Benzene to Phenol with Hydrogen Peroxide

Elbs oxidation of phenols

Electrochemical oxidation of phenols

Electrolytic oxidation, phenols

Elementary Reactions of Phenol Oxidation

Enzymatic oxidation of the phenolic hydroxyl group

Enzymatic oxidations of phenols

Enzymatic oxidative polymerization of phenols

Enzymes phenol-oxidizing

Ethylene oxide with phenolic hydroxyls

HRP-catalyzed oxidation of phenols

Hydroquinone phenol oxidization

Hydroxylation, aromatics phenol oxidation, hydrogen peroxide

In phenol oxidation

Iron oxide, oxidizing phenolic

Iron oxide, oxidizing phenolic acids

James Bond, Oxidative Stress, and Antioxidant Phenols

Lignin phenolics oxidation

Manganese oxide, oxidizing phenolic

Manganese oxide, oxidizing phenolic acids

Meta) oxides with phenols

Methyl-substituted phenol oxidation

Non-phenolic oxidative coupling

Ortho-para Oxidative phenolic coupling

Oxidation alkyl substituted phenols with

Oxidation chlorinated phenols

Oxidation of 2,6 Disubstituted Phenols

Oxidation of Alcohols and Phenols

Oxidation of Alcohols, Enols, and Phenols

Oxidation of Benzene to Phenol by

Oxidation of Phenol to Catechol and Hydroquinone

Oxidation of Phenols Quinones

Oxidation of Phenols and Catechols

Oxidation of benzene to phenol

Oxidation of p-substituted phenols

Oxidation of phenolate

Oxidation of phenolic compounds

Oxidation of phenolics

Oxidation of phenols

Oxidation of phenols (Elbs reaction)

Oxidation of phenols by Cr(VI)

Oxidation of phenols in hydrocarbon solutions

Oxidation of phenols in polar solutions

Oxidation of the phenolic hydroxyl group

Oxidation phenolate ligands

Oxidation rates of phenol

Oxidation reactions of phenols

Oxidation reactions phenol synthesis from benzene

Oxidation to phenol

Oxidation, alcohols phenols

Oxidation, phenolic compound, enzymatic

Oxidations of phenols and aromatic amines

Oxidations phenolic coupling

Oxidative 2- phenols, silver© oxide

Oxidative Carbonylation of Phenol

Oxidative Coupling of Phenols and Phenol Ethers

Oxidative Dearomatization of Phenols and Related Substrates

Oxidative Polymerization of Phenols

Oxidative addition phenol derivatives

Oxidative coupling 2- phenols, silver® oxide

Oxidative coupling of 2,6-disubstituted phenols

Oxidative coupling of phenols

Oxidative coupling reaction of phenol

Oxidative coupling reaction phenolic monomers

Oxidative coupling, phenolic

Oxidative coupling, phenolic monomers

Oxidative cyclization, phenol ethers

Oxidative dearomatization of phenols

Oxidative dimerization, chiral phenols

Oxidative hydrogenation 91 phenol

Oxidative phenol coupling

Oxidative phenol-ethers

Oxidative phenolic coupling alternatives

Oxidative phenolic coupling natural products

Oxidative phenols

Oxidative phenols

Oxidative polymerization of phenols and

Oxidative polymerization of phenols and anilines

Oxidative reactions of phenols

Phenol Baeyer-Villiger oxidation

Phenol Oxidation Catalyzed by Polymer-Cu Complexes

Phenol copper-catalyzed oxidation

Phenol cumene oxidation process

Phenol ethers oxidative coupling

Phenol opening, oxidative

Phenol oxidation mineralization

Phenol oxidation rates

Phenol oxidation test

Phenol polyphenylene oxides

Phenol, anodic oxidation

Phenol, electrochemical oxidation

Phenol, enzymatic reactions oxidation

Phenol, enzymic oxidative polymerization

Phenol, from benzene oxidation

Phenol, selective oxidation with aqueous

Phenolate ions, oxidation

Phenolic Reaction Products of Nitric Oxide, ONOO, or Both

Phenolic antioxidants lipid oxidation inhibition

Phenolic benzene oxide

Phenolic carbamates, oxidation

Phenolic compound antioxidative activity oxidation products

Phenolic compounds oxidation

Phenolic compounds oxidation pigments

Phenolic compounds oxidations, copper®) chloride

Phenolic ethers oxidative demethylation

Phenolic oxidation

Phenolic oxidative coupling morphine

Phenolic oxidative coupling radical mechanism

Phenols anti-oxidant properties

Phenols by oxidation

Phenols catalytic oxidation

Phenols diazo oxides

Phenols oxidation rate constants

Phenols oxidative carbonylation

Phenols oxidative cleavage

Phenols oxidative dearomatization

Phenols oxidative phosphorylation

Phenols oxidative polymerization

Phenols simultaneous oxidation

Phenols with lead oxides

Phenols with mercuric oxide

Phenols with silver oxide

Phenols, enzymatic oxidation

Phenols, oxidation potentials

Phenols, oxidation with hypervalent iodine

Phenols, oxidative dimerization

Phenols, oxidative reactions

Phenols, peroxidase-catalyzed oxidation

Phenols/polyphenols oxidation

Polyphenylene Oxides by Oxidative Polymerization of Phenols

Quinone methides, generation phenols, oxidation

Ring contraction oxidation of phenols

Selective oxidation of phenols

Solvents phenol, oxidation

Substituted phenols oxidation

Syntheses through Phenolic Oxidative Coupling

Tert-octyl phenol ethylene oxide condensates

Towards the Direct Oxidation of Benzene to Phenol

Vinyl phenols, oxidation

© 2024 chempedia.info