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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 727 (1969), S. 22-34 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Thioamides with Sulfenyl ChloridesSulfenyl chlorides react with secondary thioamides to give iminomethyl disulfides 2. The sulfur atom is attacked by the sulfenyl chloride, even when the thioamide system is substituted by electron-withdrawing groups. Asymmetric iminomethyl disulfides obtained from the reaction of primary thioamides and sulfenyl chlorides decompose very easily, and in general they have been isolated as salts. In only one case has a neutral iminomethyl disulfide (23) been isolated. Thiobenzamide condenses with chlorocarbonyl sulfur chloride (21) to give 5-phenyl-1,2,4-dithiazol-3-one (28), whereas condensation with phenylimino-chloromethane sulfenyl chloride (20) leads to the corresponding dithiazole derivative 25, but only in small amounts.
    Notes: Durch Umsetzung von sekundären Thioamiden mit Sulfenylchloriden entstehen Iminomethyldisulfide 2. Der elektrophile Angriff des Sulfenylchlorids erfolgt auch dann am Thion-Schwefel, wenn das Thioamid-System elektronenziehende Substituenten trägt. Asymmetrische Iminomethyldisulfide aus primären Thioamiden und Sulfenylchloriden sind besonders leicht zersetzlich und nur als Salze isoliert worden. Nur in einem speziellen Fall wird ein neutrales Iminomethyldisulfid (23) aus einem primären Thioamid erhalten. Thiobenzamid reagiert mit Chlorcabonylschwefelchlorid (21) unter Ringschluß zu 5-Phenyl-1.2.4-dithiazolon-(3) (28). Bei Umsetzung mit Phenylimino-chlormethansulfenylchlorid (20) weicht die Reaktion aus, und das entsprechende Dithiazol-Derivat 25 wird nur in geringem Maße gebildet.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 727 (1969), S. 35-49 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation Products of Thioamides, XXII I ). Oxidation of Pyridyl DisulfidesThe S-S-bond of pyridyl aryl disulfides is easily cleaved by oxidation with perbenzoic acid. If the benzene molecule is substituted by bulky alkyl groups, disulfide S1, S1-dioxides (10-13) can be isolated. In some cases pyridyl alkyl disulfides are oxidized to give disulfide S2, S2-dioxides (22-24). The hydrolytic cleavage of the disulfide S1, S1-dioxides 10 and 12 leads to pyridine-2-sulfinates 19 and 20. The free unstable pyridine-2-sulfinic acid was isolated only as a hygroscopic oil.
    Notes: Pyridyl-aryldisulfide werden durch Perbenzoesäure leicht oxydativ an der Disulfid-Bindung gespalten. Trägt der Aryl-Rest sterisch abschirmende Alkyl-Gruppen, so lassen sich Disulfid-S1.S1-dioxide (10-13) isolieren. Pyridyl-alkyldisulfide werden in einigen Fällen zu Disulfid-S2.S2-dioxiden (22-24) oxydiert. Die hydrolytische Spaltung der Disulfid-S1.S1-dioxide 10 und 12 liefert die Pyridinsulfinate-(2) 19 und 20. Die freie, instabile Pyridinsulfinsäure-(2) konnte nur als hygroskopisches öl erhalten werden.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 727 (1969), S. 50-60 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation Products of Thioamides, XXIIII). Oxidation of Iminomethyl Disulfides and Pyridyl DisulfidesOxidation of iminomethyl disulfides with perbenzoic acid affords thioamide S-oxides of type 2, whereas by oxidation of 2-pyridyl mesityl disulfides the corresponding S1-monoxides 14 are formed. After splitting of the S-S-bond 2-pyridinthione S-oxides (19) are detected. The cleavage is compared with the oxidative splitting of iminomethyl disulfides.
    Notes: Iminomethyldisulfide bilden mit Perbenzoesäure Thioamid-S-oxide vom Typ 2. Durch Oxydation von Pyridyl-(2)-mesityldisulfiden erhält man Pyridyl-(2)-mesityldisulfid-S1-monoxide (14). Nach Spaltung der S-S-Bindung werden Pyridinthion-(2)-S-oxide (19) nachgewiesen. Die Spaltungsreaktion wird mit der oxydativen Spaltung der Iminomethyldisulfide verglichen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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