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  • Alkylstannylhydrid  (1)
  • precursor chemistry  (1)
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  • 1
    ISSN: 1434-4475
    Keywords: Alkylstannylhydrid ; Hydrierung ; Organochlorsilane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Organotinchlorides of the general formula R3SnCl and R2SnCl2 (R=Me,n-Bu, Ph) can easily be converted into the corresponding hydrides R3SiH and R2SiH2 employing NaH in diethylene glycol dialkyl ethers. Using trialkyltinhydrides like Bu3SnH in combination with a catalyst (tertiary amines, N-heterocycles, phosphonium or ammonium salts), Si-Cl bonds in mono- and disilanes are hydrogenated. In the case of disilanes, Si-Si bond cleavage and concurrent hydrogenation can be afforded with strongly nucleophilic catalysts. Partial hydrogenation is also possible. The whole process can be run cyclically.
    Notes: Zusammenfassung Organostannylchloride vom Typ R3SnCl und R2SnCl2 (R=Me,n-Bu, Ph) können in einfacher Weise mit NaH zu den entsprechenden Hydriden R3SnH und R2SnH2 umgesetzt werden, wenn als Lösungsmittel Diethylenglykoldialkylether verwendet werden. Trialkylzinnhydrid wie Bu3SnH können zur Hydrierung von Si-Cl-Bindungen in Mono- und Disilanen eingesetzt werden, wobei in Abhängigkeit vom notwendigen Katalysator (tertiäre Amine, N-Heterocyclen, λ3-Phosphorverbindungen, Ammonium- und Phosphoniumsalze) nur hydriert oder (mit stark nucleophilen Katalysatoren) auch die Si-Si-Bindung gespalten werden kann. Durch Verwendung eines Unterschusses an Bu3SnH können auch gezielt teilhydrierte Produkte erhalten werden. Das Verfahren kann als Kreislaufprozeß geführt werden.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of sol gel science and technology 13 (1998), S. 295-298 
    ISSN: 1573-4846
    Keywords: precursor chemistry ; calorimetry ; enzyme immobilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Using the sol-gel process, the enzyme glucose-oxidase was immobilized in modified SiO2 layers. The tetraethoxysilane based sol was varied by veratrylaldehyde, aminopropyltriethoxysilane and an azomethine compound, which was synthesized from both molecules. Changes in reaction kinetics of the sol-gel process by addition of veratrylaldehyde were observed by 29Si NMR measurements. The fixation of this additive in the final gel was clarified by FTIR spectroscopy. The influence of inserted functional groups on the enzyme activity was determined by calorimetry. The Enzyme Thermistor is a fast and uncomplicated method to obtain comparative results of sol-gel immobilized enzyme activity. Differences in immobilization effects were found dependent on structure and concentration of additives.
    Type of Medium: Electronic Resource
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