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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1009-1012 
    ISSN: 0009-2940
    Keywords: ESR, biphenyl-2-carbodithioates ; 9-Fluorenones, sterical hindrance ; Radical anions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of 9-Fluorenone Radical Anions during Electroreduction of Sterically Hindered Methyl Biphenyl-2-dithiocarboxylatesESR signals due to the radical anions of the 9-fluorenones 4 and 5 are observed besides the spectra of the radical anions of the tert-butylated methyl biphenyl-2-dithiocarboxylates 1 and 2 if the latter are electroreduced in dimethylformamide or acetonitrile. A mechanism for the observed reaction is suggested.
    Notes: Nach Elektroreduktion der tert-butylierten Biphenyl-2-dithiocarbonsäure-methylester 1 und 2 in Dimethylformamid oder Acetonitril beobachteten wir neben den ESR-Spektren der entsprechenden Radikalanionen die Signale von Radikalanionen der 9-Fluorenone 4 und 5. Ein Mechanismus für die Bildung der 9-Fluorenon-Ketyle wird vorgeschlagen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 187-191 
    ISSN: 0009-2940
    Keywords: Benzyl radicals ; Dithiocarboxylates, sterically hindered ; Radical anions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Persistent Benzyl Radicals by Protonation of the Radical Anions of Sterically Hindered Dithiobenzoic EstersESR signals due to a second species are observed besides the spectra of the corresponding radical anions when the methyl ortho-(tert-butyl)dithiobenzoates 1, 4, and 6 are electroreduced in situ in dimethylformamide. It is shown by investigation of model compounds as well as semiempirical MNDO/CI-MO calculations, that these arise from α-alkylthio-α-mercaptobenzyl radicals 3, 14, and 15 which are formed by protonation of the radical anions at the thiocarbonyl sulfur atom.
    Notes: Nach in-situ-Elektroreduktion der ortho-(tert-Butyl)dithiobenzoesäure-methylester 1, 4 und 6 in Dimethylformamid beobachteten wir neben den ESR-Spektren der entsprechenden Radikalanionen die Signale einer zweiten Spezies. Durch Untersuchung von Modellverbindungen sowie semiempirische MO-Rechnungen nach dem MNDO/CI-Verfahren wird gezeigt, daß es sich dabei um die α-Alkylthio-α-mercaptobenzyl-Radikale 3, 14 und 15 handelt, die durch Protonierung der Radikalanionen am Thiocarbonylschwefel entstehen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1397-1402 
    ISSN: 0009-2940
    Keywords: Cyclobutane-1,3-diones ; Cyclobutane-1,3-dithiones ; Radical anions ; Diradical dianions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,4-Bis(diphenylmethylene)-1,3-cyclobutanedione (1) is transformed into its sulphur analogues 2 and 3 with Lawesson's or Davy's reagent 5a,b. An X-ray structural analysis is performed on 3. The electrochemistry of these compounds is surveyed. The products of the electrochemical reduction exhibit ESR spectra, which could not be attributed to the radical anions 1-•, 2-•, and 3-•. Extensive semiempirical AM1/Cl calculations suggest the spectra to correspond to the diradical dianions. The experimental data are discussed in terms of the theoretical results.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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