Výsledky vyhledávání - "Klaus K. Mayer"

Electron impact induced fragmentation of aromatic N-alkoxy-imines I. Ring closure in (M-CH2O)+? ions by intramolecular aromatic substitution

Autor: Herwig Pongratz, Wolfgang Wiegrebe, Klaus K. Mayer

Publikováno v: Monatshefte f�r Chemie Chemical Monthly. 128:659-673

N-Butoxy- and N-propoxy-imines derived fromo-,m-, andp-substituted benzaldehydes (X = F, Cl, Br, I) decompose upon electron impact to the respective aldoximes by loss of C n H2n and competitivelyvia 1,5-distonic radical cations by loss of CH2O to 1,3

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b28504806590227d6ba68eed23f52ab1
https://doi.org/10.1007/bf00807597

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Modification of DNA bases by anthralin and related compounds

Autor: Wolfgang Wiegrebe, Klaus K. Mayer, Peter Leukel, Klaus Müller

Publikováno v: Biochemical Pharmacology. 49:1607-1613

Modification of bases in calf thymus DNA by treatment with the antipsoriatic drug anthralin was studied. The products of DNA bases were identified and their yields measured by gas chromatography-mass spectrometry with selected ion monitoring. Treatme

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::52d5d9ce5579721e57691a97e48f451c
https://doi.org/10.1016/0006-2952(95)00096-i

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Sulfemodin 8-O-β-d-Glucoside, a New Sulfated Anthraquinone Glycoside, and Antioxidant Phenolic Compounds from Rheum emodi

Autor: Riddhi Pradhan, B. Kopp, Beate Bahr, Klaus K. Mayer, Liselotte Krenn, D. H. Paper, Armin Presser

Publikováno v: Journal of Natural Products. 66:1107-1109

A sulfated emodin glucoside, emodin 8-O-beta-D-glucopyranosyl-6-O-sulfate (1), was isolated from the roots of Rheum emodi in an investigation of the active constituents of this Nepalese medicinal plant, and its structure was determined by spectroscop

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba939b1cd72adf3cb2fedb8acff2c6a7
https://doi.org/10.1021/np0301442

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Electron-impact Induced and Thermal Decomposition of Dithranol Derivatives, II: Multiple H-Rearrangements in 10-Benzylthio-dithranol Radical Cations Elektronenstoß-induzierter und thermischer Zerfall von Dithranol Derivaten, 2. Mitt.: Mehrfache H-Umlagerungen in den Molekülionen des 10-Benzylthio-dithranols

Autor: Hsu-Shan Huang, Klaus K. Mayer, Wolfgang Wiegrebe

Publikováno v: Archiv der Pharmazie. 327:735-738

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cf048ad4fab91dd5384f5d83abba9497
https://doi.org/10.1002/ardp.19943271110

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ChemInform Abstract: ortho-Effects in Electron Impact Mass Spectrometry

Autor: Dong-Ung Lee, Klaus K. Mayer, Wolfgang Wiegrebe, G. Stoeber, I. Weiss, F. Knefeli, H. G. Striegel

Publikováno v: ChemInform. 24

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a49a2f414cfc72d08aa55a7fe572cc7d
https://doi.org/10.1002/chin.199326028

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ChemInform Abstract: Structure of the Alkaloid Nazlinin

Autor: K. Hahn, Klaus K. Mayer, Wolfgang Wiegrebe, M. Ertan, Siavosh Mahboobi

Publikováno v: ChemInform. 28

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0c2e291d56f2a3076d869a396b7e54f4
https://doi.org/10.1002/chin.199718252

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ChemInform Abstract: Electron Impact Induced Fragmentation of Aromatic N-Alkoxy-imines. Part 1. Ring Closure in (M-CH2O)+× Ions by Intramolecular Aromatic Substitution

Autor: Herwig Pongratz, Wolfgang Wiegrebe, Klaus K. Mayer

Publikováno v: ChemInform. 28

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa87ae0b07cff809d8d95890e7f40d5c
https://doi.org/10.1002/chin.199740116

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ChemInform Abstract: Electron Impact Induced Fragmentation of 4-Aryl-4,6,7,8-tetrahydro-1H,3H-quinazoline-2,5-diones

Autor: Stefan Dove, Wolfgang Wiegrebe, Herwig Pongratz, Klaus K. Mayer, Mevlüt Ertan

Publikováno v: ChemInform. 29

The mol. ions (M+×) of 4-substituted aryl-4,6,7,8-tetrahydro-1H,3H-quinazoline-2,5-diones (Biginelli compds.) (2 - 18) decomp. by loss of the substituents X of the Ph group (X = o-F; o-, m-, p-Cl, Br, OCH3, CH3; 2,3-, 2,4-, 2,6-, 3,4-dichloro) givin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::082b21329a60944f734a6962f87923ff
https://doi.org/10.1002/chin.199838028

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Cardenolide aus Ornithogalum nutans (2 n = 30), 2. Mitteilung+ / Cardenolides from Ornithogalum nutans (2 n = 30), Part 2+

Autor: Roland Ferth, Wolfgang Robien, Andreas Baumann, Brigitte Kopp, Klaus K. Mayer

Publikováno v: Zeitschrift für Naturforschung B. 47:1459-1468

From bulbs of Ornithogalum nutans L. (2 n = 30) nineteen cardenolides were isolated by column chromatography and TLC. Thirteen substances were structurally elucidated as glycosides of Strophanthidin, Sarmentosigenin, Sarmentogenin, Bipindogenin, 2a-H

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::78208035a06f7eab63468cba20895681
https://doi.org/10.1515/znb-1992-1018

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Massenspektrometrische Untersuchungen an isomeren α,β- und β, γ-ungesättigten Ketonen mit raumerfüllenden Substituenten

Autor: Wolfgang Wiegrebe, Hans-Günter Striegel, Klaus K. Mayer

Publikováno v: Archiv der Pharmazie. 325:211-218

Die Massenspektren der α,s- und s, γ-ungesattigten Ketone 1-4 (Schema 1) sind, abhangig von der Stereochemie an der Doppelbinduung, stark unterschiedlich: bei Keton 2 mit E-Konfiguration uberwiegt McLafferty-Fragmentierung, beim Keton 1 mit Z-Konfi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c8da6343667b19b1fde7dfbefcdf061f
https://doi.org/10.1002/ardp.19923250405

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