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  • 11
    Electronic Resource
    Electronic Resource
    Elektrochemische Reduktion polycyclischer aromatischer Kohlenwasserstoffe (PAK) in einem Fließreaktor24. Mitt. Elektroreduktion organischer Verbindungen; 23. Mitt.: Strelow, T.; Voss, J.; Baum, W.: Z. Naturforsch. 48b (1993) S. 1288/1290. (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 974-976 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330660723
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  • 12
    Electronic Resource
    Electronic Resource
    Thioketyle, 5. Isotrope ESR-Parameter von Thio- und Selenoketylen (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2255-2277 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thioketyls, 5. Isotropic ESR Parameters in Thio- and SelenoketylsThe preparation of aliphatic and aromatic thio- and selenoketones and of some of their D-, 13C-, and 77Se derivatives is described. Most of these compounds yield persistent radical anions on one-electron electroreduction, which are studied by ESR spectroscopy.  -  The 13C coupling constants allow the conclusion that in thio- and selenoketyls the spin density is mainly located at the central carbon atom.  -  The observed temperature dependence of the coupling constants is in agreement with a planar geometry of the thioketyl molecule.
    Notes: Die Darstellung aliphatischer und aromatischer Thio- und Selenoketone sowie einiger ihrer D-, 13C- und 77Se-angereicherten Derivate wird beschrieben.  -  Bei der elektrochemischen Einelektronen-Reduktion liefern die meisten Vertreter persistente Radikalanionen, die ESR-spektroskopisch untersucht werden. Die gemessenen isotropen 13C-Kopplungskonstanten erlauben den Schluß, daß in der Thio- bzw. Selenoketyl-Gruppe die Spinpopulation am zentralen C-Atom am größten ist.  -  Die beobachtete Temperaturabhängigkeit der Kopplungskonstanten ist mit einer planaren Geometrie des Thioketyl-Moleküls in Einklang.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130620
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  • 13
    Electronic Resource
    Electronic Resource
    Die EPR-Spektroskopie als Methode zur Konformationsanalyse (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 84 (1972), S. 223-223 
    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.19720840521
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  • 14
    Electronic Resource
    Electronic Resource
    Darstellung S-isotopensubstituierter ThiocarbonylverbindungenDiese Arbeit wurde vom Fonds der Chemischen Industrie unterstützt. (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 89 (1977), S. 743-744 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19770891016
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  • 15
    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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  • 16
    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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  • 17
    Electronic Resource
    Electronic Resource
    The 2,4-Bis(diphenylmethylene)-1,3-cyclobutane-dione Diradical Dianion and its Sulphur Analogues2) (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1397-1402 
    Details
    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
    URL: http://dx.doi.org/10.1002/cber.19911240613
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  • 18
    Electronic Resource
    Electronic Resource
    Thioketyle, 8. Radikalanionen von α-Thioxoketonen („Monothiosemidione“) (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2221-2228 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thioketyls, 8. Radical Anions of α-Thioxoketones (“Monothiosemidiones”)Radical anions (“monothiosemidiones”) 5 are obtained by in-situ electroreduction of α-thioxoketones. Conclusions about the spin density distribution are drawn from their ESR spectra. The unpaired electron is mainly located in the central CO—CS group. - Only 5a-g exhibit proton hfs splittings, and that for the protons of the thiobenzoyl but not of the benzoyl group. 13C-satellites of the CS- and CH3-carbon atoms are observed in the spectra of 5h-j. From the latter π-spin populations of the thiocarbonyl carbon atom of 0.82 (5h) and 0.54 (5j), respectively, are calculated.
    Notes: Durch in-situ-Elektroreduktion werden α-Thioxoketone in die Radikalanionen („Monothiosemidione“) 5 übergeführt. Aus deren ESR-Spektren lassen sich Rückschlüsse über die Aufenthaltswahrscheinlichkeit des ungepaarten Elektrons ziehen. Die zentrale CO—CS-Gruppe enthält den überwiegenden Teil der Spindichte. - Nur bei 5a-g treten meßbare Protonen-HFS-Aufspaltungen auf, und zwar für die Protonen der Thiobenzoyl- nicht aber der Benzoylgruppen. Bei 5h-j beobachtet man 13C-Satelliten der CS- und CH3-Kohlenstoffatome. Aus letzteren erhält man π-Spinpopulationen am Thiocarbonyl-C-Atom von 0.82 (5h) bzw. 0.54 (5j).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150618
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  • 19
    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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  • 20
    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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