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  • 1
    Electronic Resource
    Electronic Resource
    The alcoholysis and phenolysis of isosteric isobutyl(isopropoxy)silanethiols catalyzed by 4-dimethylaminopyridine or triethylamineContributions to the chemistry of silicon-sulfur compounds 63[1]. (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 8 (1997), S. 245-251 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction rates of alcoholysis of isosteric silanethiols iBun(iPrO)3-nSiSH, n = 0-3, in the presence of the tertiary amines, 4-dimethylaminopyridine (DMAP) or triethylamine (NEt3), were measured in benzene and in acetonitrile solutions under pseudo-first-order conditions. The catalytic activity of NEt3 is low. The alcoholysis catalyzed by DMAP shows features of a nucleophilic catalysis. The protonation of the catalyst (DMAP or NEt3) by silanethiols causes substantial deviations from pseudo-first-order kinetics. Phenolysis of silanethiols is effectively catalyzed by both DMAP and NEt3. © 1997 John Wiley & Sons, Inc. Heteroatom Chem 8: 245-251, 1997.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Silicium-Schwefel-Verbindungen. 48 [1]. Untersuchungen über katalytische Wirkung von Pyridin- Derivaten und N-haltigen Heterocyclen auf die Alkoholyse der Si—S-Bindung von Trialkoxysilanthiolen (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 551 (1987), S. 209-214 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Silicon-Sulphur Compounds. 48. Investigations on Catalytic Activity of Pyridine Derivatives and N-containing Heterocycles on the Alcoholysis of the Si—S Bond of TrialkoxysilanethiolsThe effectiveness of pyridine derivatives and N-containing heterocycles on the ethanolysis of trialkoxysilanethiols has been investigated by kinetic measurements. Imidazol, 2-methylimidazol and 4-dimethylaminopyridine proved to be especially efficient. The addition of triethylamine reduces the rates of catalysed reactions significantly. The results were discussed in meaning of a nucleophilic catalysis.
    Notes: Die Wirksamkeit von Pyridin-Derivaten und N-haltigen Heterocyclen auf die Ethanolyse der Si—S-Bindung von Trialkoxysilanthiolen wurde durch kinetische Messungen untersucht. Als besonders wirksam erwiesen sich Imidazol, 2-Methylimidazol und 4-Dimethylaminopyridin. Die Zugabe von Triethylamin setzt die Reaktionsgeschwindigkeit von katalysierten Umsetzungen bedeutend herab. Die Ergebnisse werden im Sinne einer nukleophilen Katalyse diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875510824
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  • 3
    Electronic Resource
    Electronic Resource
    Sila-Pharmaka, 36. Sila-Procyclidin: Eine neue Synthese sowie Untersuchungen zur peripheren und zentralen anticholinergen Wirkung (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 51-57 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sila-Pharmaca, 361). - Sila-Procyclidine: A New Synthesis as well as Investigations of the Peripheral and Central Anticholinergic ActivityStarting with Cl3SiCH2Cl, sila-procyclidine (1b) as well as its derivatives 2b (sila-trihexyphenidyl), 3b, and 4b (sila-cycrimine) were prepared by a new six-step synthesis with a total yield of 16 (1b), 19 (2b), 8 (3b) and 7% (4b), respectively. - Comparative in vivo investigations (mice, per os administration) with respect to the peripheral and central anticholinergic activity have shown that the silicon compound 1b is advantageous over the carbon analogue 1a (procyclidine).
    Notes: Sila-Procyclidin (1b) sowie dessen Derivate 2b (Sila-Trihexyphenidyl), 3b und 4b (Sila-Cycrimin) wurden - ausgehend von Cl3SiCH2Cl - durch eine neue, sechsstufige Synthese mit einer Gesamtausbeute von 16 (1b), 19 (2b), 8 (3b) bzw. 7% (4b) dargestellt. - Vergleichende in-vivo-Untersuchungen (Maus, per-os-Applikation) hinsichtlich der peripheren und zentralen anticholinergen Wirkung haben gezeigt, daß die Silicium-Verbindung 1b dem Kohlenstoff-Analogon 1a (Procyclidin) überlegen ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870109
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