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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 102 (1971), S. 1834-1843 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Ammonolyse des 1,3-Dichlortetramethyldisilazans (I) führt nicht nur zu Oktamethylcyclotetrasilazan (III), sondern auch zu Hexamethylcyclotrisilazan (II). Das Mengenverhältnis bei der Bildung der beiden Ringsysteme ist, wie bei der Ammonolyse des Dimethyldichlorsilans, weiten Schwankungen unterworfen, die nicht über die jeweilige Konzentration von Dimethyldichlorsilan bzw. I oder den Übergang zum alkalischen Milieu kontrollierbar sind (Schema 1 und Tab. 1). III siedet bei 115°/11 Torr bzw. 239°/760 Torr; es ist im Vak. jedoch bereits unterhalb seines Schmelzpunkts von 97° in hohem Maße flüchtig.
    Notes: Abstract Ammonolysis of 1.3-dichlorotetramethyldisilazane leads to octamethylcyclotetrasilazane but surprisingly also to hexamethylcyclotrisilazane. The ratio of formation of both ringsystems is comparable with the ammonolysis of dimethyldichlorosilane and subject to broad fluctuations which are not controllable by specific concentrations of dimethyldichlorosilane or of 1.3-dichlorotetramethyldisilazane or by changing into alkaline milieu. Octamethylcyclotetrasilazane boils at 115°C/11 mm and 239°C/760 mm resp.; in vacuo it is highly volatile below its melting point of 97°C.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Silicon-nitrogen Compounds, IC. The Sevenmembered Silicon-nitrogen Structural Units of 1,5-Bis[(di)alkylamino]-octamethyl-trisildiazanesReaction of 1,5-dichlorooctamethyltrisildiazane with amines gives the 1,5-bis[(di)alkylamino]-octamethyl-trisildiazanes 1-7. The compounds can be transformed by shortening of the sevenmembered SiN chain to the permethylated cyclotrisilazanes 8-10 with varied substituents in position 2 or by extension of the SiN chain to permethylated cyclotetrasilazane 11 with varied substituents in position 1,2 and 8. In an analogous way, the novel inorganic eightmembered ring of phosphatrisilatetrazacyclooctane (12) has been prepared.
    Notes: Die Reaktion von 1.5-Dichlor-oktamethyl-trisildiazan mit Aminen führt zu den 1.5-Bis[(di)-alkylamino]-oktamethyl-trisildiazanen 1-7. Diese lassen sich unter Verkürzung der sieben-gliedrigen SiN-Kette zu permethylierten Cyclotrisilazanen 8-10 mit variierten Substituenten in 2-Stellung sowie unter Verlängerung der SiN-Kette zu permethylierten Cyclotetrasilazanen 11 mit variierten Substituenten in 1.2- und 8-Stellung umsetzen. Analog gelingt die Darstellung des neuartigen anorganischen Achtrings 12 mit 1 P-, 3 Si- und 4 N-Atomen als Ringgliedern.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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