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  • 1
    Electronic Resource
    Electronic Resource
    Differential pulse polarography — a convenient method for quantitative determination of 2-bromo-2-bromomethyl-pentanedinitrile (“1,2-dibromo-2,4-dicyanobutane”) [1] (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 823-823 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129788
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  • 2
    Electronic Resource
    Electronic Resource
    Elektroreduktion organischer Verbindungen, 6. Elektroreduktion N,N-disubstituierter Thioamide in Gegenwart von Elektrophilen (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4806-4820 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electroreduction of Organic Compounds, 6. Electroreduction of N,N-Disubstituted Thioamides in the Presence of ElectrophilesElectron-uptake by the N,N-disubstituted thioamides 1-4 in aprotic medium and the behaviour of their radical anions depend substantially on the nature of the thioacyl group and the nitrogen substituents as shown by polarographic and cyclovoltammetric measurements. - Good yields of the α-amino thioethers 8-13 are obtained by preparative electroreduction in the presence of alkylating agents. The corresponding α-amino-silyl thioethers 23 are further reduced to α-(trimethylsilyl)benzylamines 24. In the presence of oxygen and ethyl halide S-ethyl thiobenzoate (27) is formed from 2a or c.
    Notes: Polarographische und cyclovoltammetrische Messungen an den N,N-disubstituierten Thioamiden 1-4 im aprotonischen Medium zeigen, daß die Aufnahme von Elektronen und das Verhalten der gebildeten Radikalanionen wesentlich von den Substituenten im Thioacylrest und am Stickstoff abhängen. - Bei präparativen Elektrolysen in Gegenwart von Alkylierungsmitteln entstehen in guten Ausbeuten die α-Amino-thioether 8-13. Die entsprechenden α-Amino-silylthioether 23 werden dagegen zu α-(Trimethylsilyl)benzylaminen 24 weiterreduziert. Ist Sauerstoff und Ethylhalogenid zugegen, so erhält man aus den Thioamiden 2a und c Thiobenzoesäure-S-ethylester (27).
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181215
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  • 3
    Electronic Resource
    Electronic Resource
    Thioketyle, 9 ESR-Untersuchungen und semi-empirische MO-Rechnungen an aliphatischen Mono- und Dithiosemidion-Radikalanionen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 575-581 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Coupling constants of the 13C and 33S nuclei are determined from the ESR spectra of specifically labelled di-tert-butyl-monothiosemidione (1-·) and -dithiosemidione (2-·) radical anions, the latter being formed on one-electron reduction of 3,4-di-tert-butyl-1,2-dithiete. Spin densities are calculated from these coupling constants and, especially, from the anisotropic values. - Using the semi-empirical MNDO/Cl and MINDO3/Cl methods including configurational interaction (Cl) the geometries and theoretical spin densities are determined and discussed in terms of the experimental values.
    Notes: Aus den ESR-Spektren spezifisch mit 13C und 33S markierter Derivate werden die Kopplungskonstanten dieser Kerne im Di-tert-butyl-monothiosemidion- (1-·) und -dithiosemidion-Radikalanion (2-·) bestimmt. Letzteres entsteht bei der Einelektronen-Reduktion von 3,4-Di-tert-butyl-1,2-dithiet. Aus den Kopplungs-konstanten - insbesondere den anisotropen Werten - werden die Spindichten erhalten. - Mit Hilfe des semi-empirischen MNDO/Cl- und MINDO 3/Cl-Verfahrens unter Einbeziehung der Konfigurationswechselwirkung (Cl) werden die Geometrien der betrachteten Moleküle sowie theoretische Spindichten ermittelt und den experimentellen Daten gegenübergestellt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200418
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  • 4
    Electronic Resource
    Electronic Resource
    Elektroreduktion organischer Verbindungen, 12. Bildung von 1,3-Dithiolanen und 1,3-Dithianen durch Elektroreduktion von Dithiocarbonsäure-(ω-chloralkyl)estern (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 2245-2249 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation fo 1,3-Dithiolanes and 1,3-Dithianes on Electroreduction of ω-Chloroalkyl DithiocarboxylatesCyclic thioacetals of type 4 and 5 are formed by intramolecular nucleophilic attack in the cathodic reduction of the ω-chloroalkyl dithiocarboxylates 1 and 2. The yield of 2-tert-butyl-1,3-dithiane (4a) is 52%, whereas elimination of dithiocarboxylate anions occurs to a considerable extent in the other cases.
    Notes: Bei der kathodischen Reduktion der Dithiocarbonsäure-(ω-chloralkyl)ester 1 und 2 entstehen durch intramolekularen Ringschluß cyclische Thioacetale des Typs 4 und 5. Die Ausbeute erreicht bei 2-tert-Butyl-1,3-dithian (4a) 52%; in den anderen Fällen tritt in erheblichem Maße Eliminierung von Dithiocarboxylat-Ionen ein.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881211225
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  • 5
    Electronic Resource
    Electronic Resource
    ESR-Untersuchungen an Carbonsäureestern, 10. Bildung persistenter Benzylradikale durch Protonierung der Radikalanionen sterisch gehinderter Dithiobenzoesäureester (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 187-191 
    Details
    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
    URL: http://dx.doi.org/10.1002/cber.19891220129
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  • 6
    Electronic Resource
    Electronic Resource
    Elektroreduktion organischer Verbindungen, 13. Coelektroreduktion von Dithiocarbonsäureestern mit Halogenaromaten (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 2251-2253 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electroreduction of Organic Compounds, 13. - Coelectroreduction of Methyl Dithiocarboxylates with HalogenoarenesCoelectroreduction of methyl dithiopivalate (1) or dithiobenzoate (11) with a monohalogenobenzene does not result in any characteristic products. However, the aryl methyl dithioacetals 7 and 8 are formed on cathodic reduction of 1 in the presence of the o-dihalogenobenzenes 4 and 5, respectively. - An SNAr mechanism is proposed, which is also in accordance with the formation of 2-bromobenzenethiolate (9) from 1 and 4 or 5.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881211226
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  • 7
    Electronic Resource
    Electronic Resource
    Elektroreduktion organischer Verbindungen, 7 Bildung von Monothioacetalen bei der Elektroreduktion von Thioketonen in Alkoholen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 67-70 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thioethers 3 and monothioacetals 4 are obtained on cathodic reduction of thiopivalophenone (2) in alcohols as solvents in the presence of alkylating agents.
    Notes: Bei der kathodischen Reduktion von Thiopivalophenon (2) in Alkoholen als Lösungsmittel in Gegenwart von Alkylierungsmitteln erhält man neben den Thioethern 3 die Monothioacetale 4.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200112
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  • 8
    Electronic Resource
    Electronic Resource
    Elektroreduktion organischer Verbindungen, 91) Vereinfachte elektrochemische Darstellung von Thioacetalen aus Dithioestern (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1757-1761 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electroreduction of Organic Compounds, 91). - Convenient electrochemical Preparation of Thioacetals from DithioestersThioacetals are obtained as main products on electroreduction of alkyl dithiocarboxylates of various types in the presence of dimethyl sulfate in methanol. (Z)- and (E)-1,2-diaryl-1,2-bis-(methylthio)ethenes are formed as byproducts. No reduction to form benzyl sulfides occurs.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871201023
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  • 9
    Electronic Resource
    Electronic Resource
    ESR-Untersuchungen an Carbonsäureestern, 12. Bildung von 9-Fluorenon-Radikalanionen durch Elektrolyse von sterisch gehinderten Biphenyl-2-dithiocarbonsäure-methylestern (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1009-1012 
    Details
    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
    URL: http://dx.doi.org/10.1002/cber.19891220534
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  • 10
    Electronic Resource
    Electronic Resource
    The Chemistry of Sulphones and Sulphoxides. Herausgegeben von S. Patai, Z. Rappoport und C. Stirling. Wiley, Chichester 1988. XVI, 1210 S., geb £ 235.00. - ISBN 0-471-91588-2 (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 101 (1989), S. 231-231 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19891010239
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