Aryloxy Groups Research Articles

An electron spin resonance study of the oxidation of benzene solutions of phenols by means of silver oxide

The heterogeneous oxidation of some substituted phenols has been studied by means of electron spin resonance. Strong signals, observed during the oxidation of the phenols with a free para -position, are due to secondary radicals derived from C 4 —O linked dimeric and polymeric phenols ( A ) are not to substituted 4, 4'-di-pheno-semiquinones ( B ). Special attention has been given to the oxidation of 2, 6-dimethylphenol which yields a radical with non-equivalent methyl groups. The e. s. r. spectra of the secondary radicals from some 4-substituted 2, 6-dimethylphenol are identical to each other and to that from 2, 6-dimethylphenol itself. This indicates that in these radicals the para -substituent had been displaced by an aryloxy group. The ease of this displacement can be determined by use of the flow technique.

Salcomine‐catalyzed oxidations of some phenols: A new method for the preparation of a number of para‐benzoquinones

AbstractBis(salicylidene)ethylenediiminocobalt(II) (salcomine)* is a homogeneous catalyst for the oxidation of phenols with molecular oxygen in solutions of chloroform or methanol at room temperature. A number of substituted phenols with a free para‐position have been studied; in most cases the corresponding para‐benzoquinone was the main reaction product. Compounds originating from coupling of aryloxy radicals were also detected or isolated. Some speculations on the mechanism of the reaction have been made.

Synthesis of Some α,β-Unsaturated β,δ-Disubstituted δ-Lactones

A series of 18 new α-β-unsaturated β,δ-disubstituted δ-lactones was synthesized as possible therapeutic agents. The majority of the compounds described contain an aryloxy group in the β-position of the lactone ring, while those naturally occurring in Piper methysticum all contain an alkoxy group in this position. Some of the lactones were hydrogenated by means of palladium-on-charcoal to the corresponding dihydro derivatives. The infrared absorption spectra of most of the synthesized compounds were also studied. A series of 18 new α-β-unsaturated β,δ-disubstituted δ-lactones was synthesized as possible therapeutic agents. The majority of the compounds described contain an aryloxy group in the β-position of the lactone ring, while those naturally occurring in Piper methysticum all contain an alkoxy group in this position. Some of the lactones were hydrogenated by means of palladium-on-charcoal to the corresponding dihydro derivatives. The infrared absorption spectra of most of the synthesized compounds were also studied.

Syntheses by Free Radical Reactions. VI. The Addition of Stable Aryloxy Radicals to Unsaturates

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses by Free Radical Reactions. VI. The Addition of Stable Aryloxy Radicals to UnsaturatesW. R. Hatchard, R. D. Lipscomb, and F. W. StaceyCite this: J. Am. Chem. Soc. 1958, 80, 14, 3636–3640Publication Date (Print):July 1, 1958Publication History Published online1 May 2002Published inissue 1 July 1958https://doi.org/10.1021/ja01547a041RIGHTS & PERMISSIONSArticle Views73Altmetric-Citations8LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (644 KB) Get e-Alerts Get e-Alerts

THE INSECTICIDAL ACTIVITY OF SOME ORGANOPHOSPHORUS COMPOUNDS AGAINST THE MIGRATORY LOCUST (LOCUSTA MIGRATORIA MIGRATORIOIDES REICHE & FAIRM.)

Although the insecticidal effectiveness of a compound is dependent on many factors, such as Solubilities and detoxification, there appear to be distinct relationships between chemical structure and insecticidal activity. The insecticidal activity of paraoxon was significantly greater to the adult males of Locusta migratoria migratorioides than that of all other nitrophenyl‐phosphorus compounds tested. This may be attributed to the direct action of the compound, involving no change from inactive to active form in vivo, and also to a better translocation of the compound from the point of application to the site of action. The toxicity of injected paraoxon was of the same order as that topically applied. Parathion, its isomers, and ethyl p‐nitrophenyl phenyl phosphonothionate (EPN) were approximately equivalent, whereas malathion, although relatively low in toxicity, with an ED50, of 29 μg./insect, was still a reasonably effective insecticide. Methyl, ethyl and iso‐propyl esters were effective in that order of toxicity. Substitution of other alkoxy or aryloxy groups resulted in loss of activity.