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  • Organic Chemistry  (5)
  • Cyclodextrins
  • 2,8-dimethyl-1,7-dioxaspiro[5.5]undecane
  • Wiley-Blackwell  (5)
  • 1975-1979  (5)
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  • Wiley-Blackwell  (5)
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Year
  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Amino Acids and Peptides, II. - Preparation of 2-Aminooxazole Derivatives from Peptide Amides with Hexafluoroacetic AnhydrideC-Terminal amino acid amide residues of peptide amides react with hexafluoroacetic anhydride to form stable 5-(trifluoroacetylamino)oxazole derivatives. Several representatives of this class of compounds have been synthesized and their structures determined by 1H-NMR and mass spectrometry and by their chemical reactions. The heterocyclization reaction can be used for the formation of volatile derivatives in the analysis of peptide amides on a microgram scale and for the identification of the C-terminal amino acid residue in peptide amides.
    Notes: C-Terminale Aminosäureamidreste von Peptidamiden reagieren mit Hexafluoracetanhydrid in guten Ausbeuten zu stabilen 5-(Trifluoracetylamino)oxazolderivaten. Verschiedene Vertreter dieser Verbindungen wurden dargestellt und ihre Struktur durch 1H-NMR-, Massenspektrometrie und chemische Reaktionen charakterisiert. Die Heterocyclisierungsreaktion kann im Mikrogramm-Maßstab zur Herstellung flüchtiger Derivate bei der Analytik von Peptidamiden und zur Identifizierung der C-terminalen Aminosäure von Peptidamiden benutzt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolites of Microorganisms, 182.  -  Structure Elucidation of the Nucleoside Antibiotic Nikkomycin XIn addition to the previously described nikkomycin Z, the structure of which could be confirmed, a new chitin synthase inhibiting component, nikkomycin X, could be isolated from the culture filtrate of Streptomyces tendae. Nikkomycin X is a structural isomer of nikkomycin Z and contains a 4-formyl-4-imidazolin-2-one unit instead of uracil. The structure was established by spectroscopic methods, chemical degradation and partial synthesis. Biological activity and antibiotic spectra of the two nikkomycins are similar.
    Notes: Neben dem bereits früher beschriebenen Nikkomycin Z, dessen Struktur bestätigt werden konnte, wurde aus dem Kulturfiltrat von Streptomyces tendae eine weitere die Chitinsynthase hemmende Komponente, Nikkomycin X, isoliert, die mit Nikkomycin Z strukturisomer ist, aber anstelle von Uracil 4-Formyl-4-imidazolin-2-on enthält. Die Struktur wurde mit spektroskopischen Methoden, durch chemischen Abbau und durch Teilsynthesen bewiesen. Die biologischen Aktivitäten und die Wirkungsspektren der beiden Nikkomycine sind ähnlich.
    Additional Material: 4 Ill.
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  • 3
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolites of Microorganisms, 171.  -  Ethericin A; Isolation, Characterization and Structure of a Novel Antibiotically Active Diphenyl EtherThe previously unknown antibiotic ethericin A has been isolated from cultures of Aspergillus funiculosus. It inhibits the growth of bacteria and some fungi. Ethericin A has been identified by mass spectrometry, NMR, chemical degradation and synthesis as 5,5'-dimethyl-3,3' -oxydipyrocatechol (3).
    Notes: Das bisher unbekannte, aus Aspergillus funiculosus isolierte Ethericin A hemmt das Wachstum von Bakterien und einigen Pilzen. Durch Massen- und Kernresonanzspektrometrie, chemischen Abbau sowie Synthese ist die Verbindung als 5,5'-Dimethyl-3,3'-oxydibrenzcatechin (3) identifiziert worden.
    Additional Material: 2 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1976 (1976), S. 2011-2020 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of the Peptide Antibiotic StenothricinThe structure of the peptide antibiotic Stenothricin was investigated by combined application of chromatography, degradation, derivatization, and mass spectrometry. Most probably Stenothricin is β-ketoacyl-D-Cys(O3H)-L-Val-D-Ser-L-Lys-Sar-D-αThr-L-Ser-L-diaminopropionic acid. The β-ketoacyl residues consist of several isomers having chain lengths of 14 to 17 carbon atoms.
    Notes: Die Struktur des Peptidantibiotikums Stenothricin wurde durch Chromatographie, Abbau und Derivatbildungsmethoden sowie Massenspektrometrie untersucht. Danach ist Stenothricin mit großer Wahrscheinlichkeit β-Ketoacyl-D-Cys(03H)-L-Val-D-ser-L-Lys-sar-D-αThr-L-Ser-L-Diaminopropionsäure, wobei die β-Ketoacyl-Reste aus mehreren Isomeren mit Kettenlängen zwischen 14 und 17 C-Atomen bestehen.
    Additional Material: 4 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 1087-1095 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Amino Acids and Peptides, I. - The reaction of N-Methylvaline and N-Methylisoleucine with Trifluoroacetic AnhydrideN-Methylvaline, N-methylisoleucine and their alkyl esters react with trifluoroacetic anhydride to form stable, highly volatile 4-alkylidene-3-methyl-2-trifluoro-1,3-oxazolidin-5-ones in high yields. The structures of these compounds were established by proton magnetic resonance, mass spectrometry, und gas chromatography.
    Notes: Die Reaktion von N-Methylvalin, N-Methylisoleucin und deren Alkylester mit Trifluoracetanhydrid führt unter milden Bedingungen in guten Ausbeuten zu 4-Alkyliden-3-methyl-2-trifluormethyl-1,3-oxazolidin-5-onen. Die Struktur dieser leicht flüchtigen, stabilen Verbindungen wurde mittels protonmagnetischer Resonanz, Massenspektrometrie und Gaschromatographie bestimmt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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