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  • 1975-1979  (3)
  • Chemistry  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 107-111 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies on Sulphochlorination of Paraffins. IV. On the Sulphochlorination of IsobutaneIn the sulphochlorination of isobutane at -20 to -10°C a mixture of 20-25% tert.-butyl and 75-80% of isobutyl sulphochlorides is formed. The mixture has been analyzed by 1H- and by 13C-n.m.r.-spectroscopy. It is possible to transform the mixture of sulphochlorides into mixtures of the corresponding sulphonates, sulphonic acid methyl esters or sulphonic acid demithylamides. During the work-up of the sulphochlorination mixtures it is necessary to keep the temperature low, because tertiary butyl sulphochloride is desulphonated at a noticeable rate already at temperatures above 35°C.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Sulphochlorination of Paraffins. I. Kinetic Studies on the Monosulphochlorination of the n-Paraffins C6—C16The monosulphochlorides in the reaction mixtures of the sulphochlorination of n-paraffins may be transformed into the gaschromatographic separable sulphonic acid dimethyl amides by reaction with dimethylamine in ether.So the analysis of the isomers in the mixtures from sulphochlorination of n-paraffins C5—C16 becomes possible. The results together with the relative rates of sulphochlorination of n-paraffins C6—C16 (determined by competitive reaction) allow the calculation of sulphochlorination rates of the different C—H-bonds in the n-paraffins C6—C16 relative to one primary C—H-bond in n-octane. For the n-paraffins C6—C8 the relative rates of sulphochlorination of different C—H-bonds agree with the corresponding relative rates of chlorination.
    Notes: Die in Sulfochlorierungsgemischen von n-Paraffinen enthaltenen isomeren Monosulfochloride lassen sich durch Umsetzen mit Dimethylamin/Äther in die gaschromatographisch trennbaren Sulfonsäuredimethylamide überführen. So ist die Isomerenanalyse der Sulfochlorierungsgemische aus den n-Paraffinen C5—C16 möglich. Die Ergebnisse sowie die durch Konkurrenzreaktion ermittelten relativen Sulfochlorierungsgeschwindigkeiten der n-Paraffine C6—C16 gestatten die Berechnung der auf eine primäre C—H-Bindung des n-Octans bezogenen relativen Sulfochlorierungsgeschwindigkeiten der verschiedenen C—H-Bindungen in den Paraffinen C6—C16. Bei den Paraffinen C6—C8 stimmen die relativen Reaktionsgeschwindigkeiten der verschiedenen C—H-Bindungen bei der Sulfochlorierung und bei der Chlorierung innerhalb der Fehlergrenzen überein.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies on Sulphochlorination of Paraffins. V. Kinetic Studies on the Sulphochlorination of Pure AlkanesulphochloridesThe mixtures of disulphochlorides formed by sulphochlorination of 1-alkanesulphochlorides C4—C9 may be analyzed gaschromatographically after transformation into the corresponding dimethylamides. The individual peaks could be identified in some cases with the aid of pure isomeric disulphochlorides, in other cases they were identified by analogy. The mixtures formed by sulphochlorination of the isomeric heptane sulphochlorides also could be analyzed after transformation into the dimethylamides; the identification of all peaks was possible by comparison of the mixtures obtained from different heptane sulphochlorides.For the alkane sulphochlorides studied the relative rates of sulphochlorination (with reference to n-octane) were determined, and therefore the relative reaction rates of the individual C—H-bonds with reference to one primary C—H-bond of n-octane could be calculated.The results show a geminal or vicinal disubstitution not to take place in noticeable amount. In position 3 or in greater distance the influence of the sulphochloride group on the reactivity of the C—H-bonds is not significant.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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