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  • 1985-1989  (6)
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  • 1
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    Isolation of 4-hydroxy-2-(hydroxymethyl)-5-methyl-3(2H)furanone from sugar amino acid reaction mixtures (1987)
    American Chemical Society
    Details
    Publication Date: 1987-11-01
    Print ISSN: 0021-8561
    Electronic ISSN: 1520-5118
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation of 4-hydroxy-2-(hydroxymethyl)-5-methyl-3(2H)furanone from sugar amino acid reaction mixtures (1987)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 35 (1987), S. 990-993 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00078a031
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese und Reaktion von α-(Dimethylamino)alkanaldimethylhydrazonen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2397-2413 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reaction of α-(Dimethylamino)alkanal DimethylhydrazonesSeveral α-(dimethylamino)aldehyde hydrazones of the general structure 11 have been obtained by alkylation of the lithium salt of 9 or by addition of Grignard reagents to 15 or 17. The compounds react with acyl chlorides to give hydrazones of unsaturated aldehydes. The same products 27 are obtained by thermal degradation of the ammonium salts 26. In the hydrazonoammonium salts 26a, g the trimethylammonium group can be substituted by a variety of nucleophiles (→ 34-39).
    Notes: Verschieden substituierte α-(Dimethylamino)aldehyd-hydrazone der allgemeinen Struktur 11 lassen sich aus dem Lithium-Salz des (Dimethylamino)acetaldehyd-dimethylhydrazons durch Alkylierung sowie durch Addition von Grignard-Verbindungen an das Ammoniumsalz 15 oder das N,O-Acetal 17 darstellen. Die Verbindungen 11 enthalten eine leicht eliminierbare Dimethylaminogruppe und gehen mit Säurechloriden oder nach Methylierung thermisch in Hydrazone 27 α,β-ungesättigter Aldehyde über. In den Salzen 26a, g läßt sich die Trimethylammoniumgruppe durch verschiedene Nucleophile verdrängen (→ 34-39).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190802
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  • 4
    Electronic Resource
    Electronic Resource
    Verlängerung von Aldehyden und Carbonsäuren um eine ungerade Anzahl von Methingruppen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2848-2858 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Methine Homologues of Aldehydes and Carboxylic AcidsDilithium salts of carboxylic acids add to glyoxal mono(dimethylhydrazone) (5) to give salts of β-hydroxy carboxylic acids. Reaction with tosyl chloride affords via decarboxylation the corresponding unsaturated aldehyde hydrazones 10 or 15, which are easily hydrolyzed and oxidized to form unsaturated carboxylic acids. By this method aldehydes and/or carboxylic acids may be extended by one methine group. Extension by three methine groups can be achieved with vinylogous monohydrazones such as 23.
    Notes: Dilithiumsalze von Carbonsäuren addieren sich an Glyoxal-mono(dimethylhydrazon) (5) zu Salzen von β-Hydroxycarbonsäuren, die bei Einwirkung von Tosylchlorid unter Decarboxylierung die entsprechenden ungesättigten Aldehyd-hydrazone 10 bzw. 15 ergeben. Hydrolyse und Oxidation führt zu ungesättigten Carbonsäuren. Auf diesem Wege lassen sich Aldehyde bzw. Carbonsäuren um eine Methingruppe verlängern. Mit vinylogen Monohydrazonen, z. B. mit 23 sind auch Verlängerungen um drei Methingruppen möglich.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190915
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  • 5
    Electronic Resource
    Electronic Resource
    Versuche zur Darstellung von Endiazeniumsalzen (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 3011-3019 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Experiments to Form Enediazenium Salts(2-Alkoxyvinyl)diazenium salts 9 and 14 are obtained by O-alkylation of glyoxal- (4) and methylglyoxal monodimethylhydrazone (13), resp., with alkyl trifluoromethanesulfonates. Bromination of N-(trimethylsilyl)enehydrazines 16 and 18 in pentane leads to the formation of solid, hydrophilic substances, for which the structures of enediazenium salts 19, α-bromohydrazones 20, or ammonium salts 21 are discussed. These compounds react with nucleophiles (alcohols, amines, thiols, and indole) to give hydrazones 24a-i substituted at C-2.
    Notes: Glyoxal- (4) und Methylglyoxal-monodimethylhydrazon (13) werden durch Trifluormethansulfonsäure-alkylester am Sauerstoff zu (Alkoxyvinyl)diazeniumsalzen 9 bzw. 14 alkyliert. N-Silylierte Enhydrazine 16 und 18ergeben mit Brom in Pentan feste, hydrophile Verbindungen, für die die Strukturen von Endiazeniumsalzen 19 oder α-Bromhydrazonen 20 bzw. Ammoniumsalzen 21 diskutiert werden. Diese Verbindungen addieren Alkohole, Amine, Thiole sowie Indol als Nucleophile am C-Atom 2 unter Bildung der Hydrazone 24a-i.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180802
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  • 6
    Electronic Resource
    Electronic Resource
    Umsetzungen mit Monohydrazonen von Dicarbonylverbindungen, XI. Von Glyoxal-mono(dimethylhydrazon) abgeleitete azavinyloge Aminalether und azavinyloge Amidiniumsalze. Ein Reaktionsvergleich (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4760-4773 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Monohydrazones of Dicarbonyl Compounds, XI. N,O-Acetal of Glyoxal Monodimethylhydrazone and (Hydrazonoethylidene)ammonium Salts as Reagents for SynthesisCH-acidic compounds react with gyloxal monodimethylhydrazone (GMD, 1), with the N,O-acetal of GMD 10a, and with (hydrazonoethylidene)ammonium salts 8 to give the respective hydrazonoethylidene derivatives. The reagents are compared.
    Notes: CH-Acide Verbindungen lassen sich mit Glyoxal-mono(dimethylhydrazon) (GMD, 1), dem N,O-Acetal von GMD 10a sowie (Hydrazonoethyliden)ammoniumsalzen 8 zu den entsprechenden Hydrazonoethyliden-Derivaten umsetzen. Die einzelnen Reagenzien werden miteinander verglichen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181211
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