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  • 1
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Derivatives of Mercaptoacrylic Acid, XII1). - 1,4-Diradicals as Intermediates of Monomerization of 1,2-Bis(arylthio)-1,2-cyclobutanediyl Dicyanides to α-(Arylthio)acrylonitrilesα-(Arylthio)acrylonitriles 4, whose preparation is described, dimerize more rapidly ot yield 1,2-bis(arylthio)-1,2-cyclobutanediyl dicyanides 6 than do α-(alkylthio)acrylonitriles to give the corresponding cyclobutane derivatives. This appears to be α-(alkylthio)acrylonitriles to give the corresponding cyclobutane derivatives. This appears to be dur to the higher mesomeric stabilization of the 1,4-diradical intermediates (e.g.9) by arylthio groups. These radicals are detected by ESR spectroscopy in the case of thermal cleavage of bis(p-methoxyphenylthio)-1,2-cyclobutanediyl dicyanides (6b).
    Notes: α-(Arylthio)acrylnitrile 4, deren Darstellung beschrieben wird, dimerisieren merklich schneller zu 1,2-Bis(arylthio)-1,2-cyclobutandiyldicyaniden 6 als α-(Alkylthio)acrylnitrile zu den entsprechenden Cyclobutan-Derivaten. Dies dürfte eine Folge der höheren Mesomeriestabilisierung der als Zwischenstufe auftretenden 1,4-Diradikale (z.B. 9) durch die Arylthiogruppen sein. ESR-spektroskopisch wurden diese Radikale im Falle der thermischen Spaltung von 1,2-Bis(pmethoxyphenylthio)-1,2-cyclobutandiyldicyanid (6b) nachgewiesen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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