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  • 1
    Electronic Resource
    Electronic Resource
    Über Reaktionen mit Betain, 24. Mitt.: Über Umsetzungen von Trimethylammoniumessigsäurebetain mit reaktiven Halogenverbindungen (1989)
    Springer
    Monatshefte für Chemie 120 (1989), S. 907-912 
    Details
    ISSN: 1434-4475
    Keywords: Trimethylammonium acetic acid betaine ; Diethyl tartronate ; 1-Carbethoxy-2-methyl-(2,4-dinitrophenyl) osazone ; 1-Carbethoxy-(2,4-dinitrophenyl) osazone ; Glycolic acid nitrile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Diethyl bromomalonate and bromoacetonitrile, respectively, react with trimethylammonium acetic acid betaine in ethanol to give diethyl tartronate and glycolic acid nitrile, respectively. By analogy, ethyl α-chloroacetonate and ethyl bromopyruvate yield the respective hydroxy derivatives which were identified by their osazones2 and3. Under the same experimental conditions, mesoxalic acid and its dimethyl ester, respectively, are formed from dibromo malonic acid and its dimethyl ester and were characterized by their known hydrazones8 and9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811130
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  • 2
    Electronic Resource
    Electronic Resource
    Über Reaktionen mit Betainen, 19. Mitt. Über den Einfluß der Substituenten am kationischen Zentrum von Betainen auf die Bildungstendenz der Di-trifluoracetyl-N-Ylide (1985)
    Springer
    Monatshefte für Chemie 116 (1985), S. 821-829 
    Details
    ISSN: 1434-4475
    Keywords: Di-trifluoracetyl-N-ylide ; Benzyl-dimethylammonium- and phenyl-dimethylammonium-acetic acid betaine ; 1,3-Dimethylammonium-butyl acetic acid betaine ; 1,4-Dimethylpiperazinium acetic acid betaine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The influence of substituents at the ammonium nitrogen of acetic acid betaines on the reaction with trifluoracetic anhydride (TFA) has been investigated. Thus benzyl-dimethyl- and phenyl-dimethyl-betaines (1a, 1b) as well as the bifunctional betaines derived from 1,3-bis-(dimethylamino)-butane (5) or 1,4-dimethylpiperazine (7) may serve as examples. From these betaines, the symmetrical compound7 gives in 50% yield 1,4-dimethyl-piperazinium-ditrifluoracetyl-dimethylide (8), while the tendency of formation of the di-acyl-N-ylides2a, 2b, and6 is rather low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809158
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  • 3
    Electronic Resource
    Electronic Resource
    Thermische Umlagerung von Aryl-aldoketen-Dimeren (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 765 (1973), S. 15-19 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermal Rearrangement of Arylaldoketene DimersArylaldoketene dimers 5 and 1 with β-lacton- or hydroxy-cyclobutenon structures and their acylated and alkylated derivatives can be thermally rearranged yielding the corresponding derivatives of naphthalene-1,3-diol 3.
    Notes: Aryl-aldoketen-Dimere 5 und 1 mit β-Lacton- bzw. Hydroxy-cyclobutenon-Struktur sowie die acylierten und alkylierten Derivate der letzteren lassen sich thermisch in Abkömmlinge des 1.3-Naphthalin-diols 3 umlagern.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19727650104
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Chemie des dimeren Phenylketens (1972)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 760 (1972), S. 171-173 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Chemistry of Dimeric Phenylketene2-Hydroxy-4-oxo-1,3-diphenyl-1-cyclobutene (1), which yields 1,3-diacetoxy-2-phenylnaphthalene in boiling acetic anhydride, can be rearranged in boiling xylene to give 1,3-dihydroxy-2-phenylnaphthalene (2).
    Notes: Es wird gezeigt, daß 2-Hydroxy-4-oxo-1.3-diphenyl-1-cyclobuten (1), welches sich in siedendem Acetanhydrid zum 1.3-Diacetoxy-2-phenyl-naphthalin umlagert, rein thermisch in siedendem Xylol in 1.3-Dihydroxy-2-phenyl-naphthalin (2) übergeführt werden kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19727600114
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesen von Heterocyclen, 175. Zur Chemie der vicinalen Triketone, VIV. Mitteilung: A. K. Müller und H. Wittmann, Z. Naturforsch. 27 b, 1971 (1972). (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1282-1285 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Heterocycles, 175.  -  The Chemistry of Vicinal Triketones, VIThe reactivities of the β-diketones phenalene-1,3-dione and indan-1,3-dione, as well as 2-aminophenalene-1,3-dione and 2-aminoindan-1,3-dione, with aromatic aldehydes are compared with regard to the different tendency toward enolization in the ring systems.
    Notes: Die Reaktivitäten der β-Diketone Phenalen-1,3-dion und Indan-1,3-dion sowie 2-Aminophenalen-1,3-dion und 2-Aminoindan-1,3-dion gegenüber aromatischen Aldehyden wurden im Hinblick auf die unterschiedliche Enolisierungstendenz im Ring verglichen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319730808
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