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  • 1980-1984  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Eine einfache Synthese von β-Chlorzimtsäurenitrilen nach einer modifizierten Vilsmeier-Haack-Arnold-Reaktion (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 915-918 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Simple Synthesis of β-Chlorocinnamonitriles by a Modified Vilsmeier-Haack-Arnold-ReactionA simple one-pot synthesis of β-chloro-cinnamonitriles 2 can be achieved by treating acetyl arenes 1 first with formamide chlorides and subsequently with hydroxyl amine hydrochloride. The formamide chlorides used are conveniently prepared from an excess of dimethyl formamide and phosphoryl chloride. However it is also possible to employ other N,N-disubstituted formamides or acid chlorides, respectively. For comparison purposes β-chloro-cinnamonitriles 2 have also been synthesized in a two-step process. Thus 3-aryl-3-chloro-(2)-iminium salts 4 are reacted with hydroxyl amine hydrochloride giving rise to 3-chloro-cinnamic aldoximes 5. The latter compounds are dehydrated to the corresponding nitriles 2 by refluxing in acetic anhydride following a known procedure.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250606
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  • 2
    Electronic Resource
    Electronic Resource
    Heterocyclisch substituierte Cumarine aus β-ChloropropeniminiumsalzenHerrn Prof. Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 255-266 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocyclic Substituted Coumarines from β-Chloropropeniminium Salts3-Chloro-3-coumar-3′-yl-propeniminium salts 7 or the derived aldehydes 10 are versatile synthons for the preparation of heterocyclic substituted coumarines 5. The transformation of the starting materials into the coumarines 5 can be carry out in more steps or in one step directly.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240210
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Synthese und Abwandlung N-substituierter 2(1 H)-Pyrimidin-thione - Ein einfacher Zugang zu Pyrimidino[2,3-b]1,3,4-thiadiazoliumsalzen (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 942-946 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Transformation of N-substituted 2(1 H)-Pyrimidine-thiones - A Simple Route to Pyrimidino [2,3-b]1,3,4-thiadiazolium SaltsN-substituted 2(1 H)-pyrimidine-thiones 4-6 can be prepared by reaction of primary amines or unsubstituted or substituted hydrazines with 3-isothiocyanato-propene-(2)-iminium salts 2, which are easily aviable from 3-chloro-propene-(2)-iminium salts 1. The 2(1 H)-pyrimidine-thiones are transformed into 2-alkylmercapto-pyrimidinium salts 7 and pyrimidino[2,3-b]1,3,4-thiadiazolium salts 9, respectively.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240612
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  • 4
    Electronic Resource
    Electronic Resource
    Über Gesetzmäßigkeiten in der π-Elektronenstruktur von heteroanalogen Polyvinylidenverbindungen (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 534-544 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On Regularities of the π-Electronic Structure of Heteroanalogous Polyvinylidene CompoundsStarting with simple forms of the equations for the eigenvalues and eigencoefficients of the π-system of heteroanalogous polyvinylidene compounds 3 several regularities in the π-electronic structure of these systems are derived and compared with known experimental facts. In this line several predictions are given for the properties of compounds unknown up to now.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250403
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