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  • Thioacetals, semicyclic  (2)
  • Analytical Chemistry and Spectroscopy  (1)
  • Benzyl radicals  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1733-1737 
    ISSN: 0009-2940
    Keywords: Dithiolactones ; Electroreduction ; Haloalkanedithioates ; Thioacetals, semicyclic ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Intramolecular cyclization occurs on electroreduction of the methyl -haloalkanedithioates 1 in methanol. The expected semicyclic thioacetals 2 are formed according to an ECEH mechanism. The biheterocycles 12 result from dimerization of intermediate radicals whereas the semicyclic ketene dithio-acetals 13 are formed by non-electrochemical processes. The 2-(methylthio)thiolanes 2 a and 16 are obtained with much higher yields and better selectivity by co-electroreduction of the -dithio-lactones 15 in the presence of dimethyl sulfate.
    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 125 (1992), S. 1641-1646 
    ISSN: 0009-2940
    Keywords: Thioacetals, semicyclic ; Carbanions ; Alkylation ; Hydroxyalkylation ; Diastereoselectivity ; Thiolanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: C,C Coupling with Sulfur-Stabilized Carbanions, 2[1]. - Reactions of the 2-(Methylthio)thiolane Carbanion with Electrophiles[2]The „semicyclic” thioacetal 2-(methylthio)thiolane (4) is easily prepared from thiolane (tetrahydrothiophene). It is readily deprotonated by butyllithium to give the lithium derivative 5, which reacts with alkyl halides, saturated and α,β-unsaturated carbonyl compounds, and benzonitrile to form the alkyl derivatives 6, carbinols 7, allyl alcohols 8, and - after hydrolysis - the ketone 9. The diastereoselectivity of the C,C coupling reaction is discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Evidence is presented which shows, contrary to the opinion expressed by Moriarty et al., that for electronic reasons internal rotation is substantially more hindered in thioamides than in amides.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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