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  • Organic Chemistry  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Addition von Dithiocarbonsäure-Derivaten an p-Chinone (1969)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 726 (1969), S. 103-109 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Addition of Dithiocarboxylic Acid Derivatives to p-QuinonesThe facile addition of α.α-disubstituted derivatives of dithioacetic acid 2 to p-quinones is described. Depending on the conditions 1.3-benzoxathioles 7 are formed as well as 1,3-benzodithioles 5. Compounds of the latter type (12, 14 and 15) can also be synthesized from the disodium salts 2 and tetrachloro-1,4-benzoquinone, 2,3-dichloro-1,4-naphthoquinone, and 2,3-dichloroquinoxaline.
    Notes: α.α-Disubstituierte Dithioessigsäure-Derivate 2 lagern sich leicht an p-Chinone an. Es entstehen dabei, abhängig von den Reaktionsbedingungen, sowohl 1.3-Benzoxathiole 7 als auch 1.3-Benzodithiole 5. Die Umsetzung von Chloranil, 2.3-Dichlor-naphthochinon-(1.4) und 2.3-Dichlor-chinoxalin mit den Dinatriumsalzen 2 ergibt ebenfalls 1.3-Benzodithiole (12, 14 und 15).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19697260116
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  • 2
    Electronic Resource
    Electronic Resource
    Eine Uracil-Imidazolidinon-Umwandlung (1974)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 1882-1889 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Uracil-Imidazolidinone Rearrangement4-Amino-1,3-dimethyl-5-nitrosouracil derivatives 1b, 3c- e treated with alkali give derivatives of 4,5-diimino-1,3-dimethyl-2-imidazolidinone 4 by opening of the uracil ring at C-6. In contrast, with 1,3-dimethylvioluric acid (3b) under the same conditions the uracil → imidazolidinone rearrangement is accompanied by preferential ring opening at C-2 yielding 2-hydroxyimino-N,N′-dimethylmesoxaldiamide (12).
    Notes: 4-Amino-1,3-dimethyl-5-nitrosouracilderivate 1b, 3c-e ergeben bei der Behandlung mit Alkali unter Öffnung des Uracilringes am C-6 Derivate des 4,5-Diimino-1,3-dimethyl-2-imidazolidinons 4. Bei der 1,3-Dimethylviolursäure (3b) erfolgt dagegen unter gleichen Bedingungen neben der Uracil → Imidazolidinon-Umwandlung bevorzugt eine Ringöffnung am C-2, wobei 2-Hydroxyimino-N,N′-dimethylmesoxaldiamid (12) entsteht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197419741120
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  • 3
    Electronic Resource
    Electronic Resource
    Massenspektrometrische Strukturfestlegung von Syntheseprodukten, IV. Synthese einiger neuer (1-Phenyl-4-pyrazolyl)essigsäuren und ihre massenspektrometrische Strukturfestlegung (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1919-1927 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structural Elucidation of Synthetic Products by Mass Spectrometry, IV.  -  Synthesis of Some New (1-Phenyl-4-pyrazolyl)acetic Acids and Determination of Their Structures by Mass SpectrometryThe isomeric 3,5-disubstituted (1-phenyl-4-pyrazolylacetic acids 3 and/or 4 are formed by cyclization of phenylhydrazine with β,β-diacylpropionic esters (1, R1 ≢ R2) followed by saponification. The structures were determined by mass spectrometry.
    Notes: Durch Cyclisierung von Phenylhydrazin mit β,β-Diacylpropionsäureestern (1, R1 ≢ R2) und anschließende Verseifung erhält man die isomeren 3,5-disubstituierten (1-Phenyl-4-pyrazolyl)-essigsäuren 3 und/oder 4. Die Strukturzuordnung erfolgte massenspektrometrisch.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319731113
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