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  • 1970-1974  (2)
  • 1971  (2)
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  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 6-15 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die vor kurzem beschriebenen 6-Trichlormethyl-2-pyrone wurden mit Zink und mit komplexen Metallhydriden reduziert. 6-Trichlormethylpyron (15) und drei an C4 verschieden alkylierte Derivate (5, 16 und 17) ergaben mit Zink in Eisessig die entsprechenden 6-Methyl-2-pyrone 18, 1, 19 und 20. Im Falle des 6-Trichlormethyl-4-(4′-methyl-pent-3′-en-yl)-2-pyrans (17) bildete sich auch 3,8,8-Trimethyl-5,6,7,8-tetrahydro-isocumarin (21).Die komplexen Metallhydrid-Reduktionen wurden am Beispiel des 6-Trichlormethyl-4-methyl-2-pyron (5) untersucht. Mit Natriumborhydrid in Äthanol entstanden 6-Dichlormethyl-4-methyl-2-pyron (6, 14%) und 6,6,6-Trichlor-3-methyl-hex-3-en-1, 5-diol (7, 37%). Mit Lithiumaluminiumhydrid in Tetrahydrofuran erhielt man 6-Chlor- (10, 47%) und 6,6-Dichlor-3-methyl-hexa-3,5-dien-1-ol (9, 19%). Für diese Hydridreduktionen wird ein Mechanismus vorgeschlagen, welcher mit den Produkten der Lithiumaluminiumdeuterid-Reduktion nicht in Widerspruch steht.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 1589-1599 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substance X, one of the three compounds obtained upon heating 5, 6-endo-epoxy-hexamethyl-bicyclo[2.2.0]hex-2-ene (11) and previously postulated by Klaus et al. [10] to be 5-acetyl-pentamethyl-bicyclo[2.1.0]pentene (9), is now shown to be hexamethyl-2-oxabicyclo[3.2.0]-hepta-3, 6-diene (10) by reinterpretation and supplementation of the spectral data and by ozonization of the dihydro derivative 16, which yields 1-acetoxy-2-acety-1-1, 2, 3, 4-tetramethyl-cyclo-butane (17). It is concluded that the Claisen equilibrium in this system lies entirely on the side of the enol ether 10; even drastic LiAIH4 conditions cannot force a reversal (10 → 9). Tetracyanoethylene adds to the enolic double bond of 10 to form the cyclo-adduct 19.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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