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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1739-1750 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Stable Carbenium Salts from Cyclic Thioacetals - 1,3-Dithienium- and 1,3-Dithiolenium SaltsThe reaction of the 2-substituted 1,3-dithianes 1 (n = 3) and the analogous 1,3-dithiolanes 1 (n = 2) with sulfuryl chloride (2) with strict exclusion of moisture leads to the new 1,3-dithienium and 1,3-dithiolenium hydrogendichlorides 3, respectively. - Compounds 3 are extremely hygroscopic and hydrolyzable, can be, however, derivated with boron trifluoride diethyl etherate to the less sensitive tetrafluoroborates 5. Hydrolysis of 3a yields the two thiolesters 6a and 7a. The structure of 6a is confirmed by its synthesis from 1,3-propanedithiol (8) and benzoyl chloride (9).
    Notes: Umsetzung der 2-substituierten 1,3-Dithiane 1 (n = 3) bzw. der entsprechenden 1,3-Dithiolane 1 (n = 2) mit Sulfurylchlorid (2) unter strengem Feuchtigkeitsausschluß ergibt die neuen hydrolyseempfindlichen 1,3-Dithienium- bzw. 1,3-Dithiolenium-hydrogendichloride 3, die sich mit Bortrifluorid-Diethylether-Komplex in die weniger empfindlichen Tetrafluoroborate 5 überführen lassen. Hydrolyse von 3a ergibt die beiden Thiolester 6a und 7a. Konstitutionsbeweisend für 6a ist dessen Synthese aus 1,3-Propandithiol (8) und Benzoylchlorid (9).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to follow the process of aggregation, viscosity measurements in dilute aqueous solution were performed with two carbohydrate amphiphiles: (i) N-octylgluconamide (C8-GA) and (ii) N-decanoyl-N-methylglucamide (C10-MGA). Both compounds ten to form a gel on cooling, the former at 65°C, the latter at 10°C. Electron micrographs have shown that the gels are composed of a loose network of thin, regularly twisted helical ropes. By viscosity measurements over a wide range of temperatures and concentrations, typical changes of the reduced viscosity were observed. Results are discussed with respect to the critical micelle concentration (CMC), the Krafft point, i. e. the critical temperature of crystallization (Tc), and the cloud point (Tcp). It is concluded that micellar aggregation to rod-shaped particles, quasi-crystalline aggregation to highly hydrated gels, and crystallization of monomers, the latter mediated by hydrogen bonding, are involved and compete with each other.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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