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  • 1
    Electronic Resource
    Electronic Resource
    Ein neues 1,3,5,7-Tetraaza-2,4,6,8-tetrasilabicyclo[4.2.0]octan (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2342-2347 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Novel 1,3,5,7-Tetraaza-2,4,6,8-tetrasilabicyclo[4.2.0]octaneThe reaction of mono- and dilithio-2,2,4,4,6,6-hexamethylcyclotrisilazane (1, 2) with aminofluorosilanes R—SiF2—NR′SiMe3 (R=F, Me; R′=CMe3, SiMe3) leads to LiF elimination and formation of the cyclotrisilazanes 3-5. The cyclodisilazane 6 is obtained by ring contraction in the reaction of compound 5 with butyllithium and F3SiN(CMe3)(SiMe3). The lithium salt of 5 forms the novel title compound 7 by an intramolecular reaction with LiF- elimination, silyl group and methanide ion migration. Another bicyclic compound 8 is obtained in the reaction of 2 with C4H9Li and F2SiMeN(SiMe3)2. The reaction mechanism is discussed.
    Notes: Mono- und dilithiiertes 2,2,4,4,6,6-Hexamethylcyclotrisilazan (1, 2) reagieren mit Aminofluorsilanen des Typs R—SiF2—NR′SiMe3 (R=F, Me; R′=CMe3, SiMe3) unter LiF-Abspaltung zu den Cyclotrisilazanen 3-5.5 reagiert mit Butyllithium und F3SiN(CMe3)(SiMe3) unter Ringkontraktion zum Cyclodisilazan 6. Intramolekular bildet das Lithiumsalz von 5 unter LiF-Abspaltung, Silylgruppen- und Methanid-Ionen-Wanderung die neuartige Titelverbindung 7. Ein weiterer Bicyclus (8) entsteht bei der Umsetzung von 2 mit C4H9Li und Me—SiF2—N(SiMe3)2. Der Bildungsmechanismus wird diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130703
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  • 2
    Electronic Resource
    Electronic Resource
    Substitution und Ringkontraktion am Cyclotrisilazansystem (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 1444-1448 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substitution and Ring Contraction at the Cyclotrisilazane System1-(Fluordimethylsilyl)-3-lithio-2,2,4,4,6,6- hexamethyl-5-(trimethylsilyl)cyclotrisilazane (1) reacts with compounds containing an acidic H-atom like ROH and R′C ≡ CH in a molar ratio of 1:1 to give the substituted compounds 2, 3 (R=C2H5, CH3), 7 (R′=n-C4H9), and LiF. Ring contraction with formation of four-membered rings is observed in the analogue reaction with the substituents R=CH3 (4), C6H5 (5) as well as R′=n-C4H9 (8) and C6H5 (9), resp.
    Notes: 1-(Fluordimethylsilyl)-3-lithio-2,2,4,4,6,6- hexamethyl-5-(trimethylsilyl)cyclotrisilazan (1) reagiert mit H-aciden Verbindungen wie ROH und R′C ≡ CH im Molverhältnis 1:1 zu den substituierten Verbindungen 2, 3 (R=C2H5, CH3), 7 (R′=n-C4H9) und LiF. Ringkontraktion zu viergliedrigen Ringen wird in analoger Reaktion für die Substituenten R=CH3 (4), C6H5 (5) sowie R′=n-C4H9 (8) und C6H5 (9) beobachtet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130423
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  • 3
    Electronic Resource
    Electronic Resource
    Silaborazine und fluorborylsubstituierte Cyclotrisilazane (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2287-2292 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Silaborazines and Fluoroboryl-substituted Cyclotrisilazanes2,2,4,4,6,6-Hexamethylcyclotrisilazanes and their lithium salts (2, 1b, 4) react with BF3-etherate to give silaborazines (8, 9, 13, 15) A BF-bridged cyclotrisilazane (10) could be isolated. Substitution at the ring occurs in the reaction of 2,2,4,4,6,6-hexamethyl-1,3-bis(trimethylsilyl)cyclotrisilazane (5) with BF3-etherate and of 1-lithio-2,2,4,4,6,6-hexamethylcyclotrisilazane (1a) with [bis(trimethylsilyl)amino]difluoroborane.
    Notes: 2,2,4,4,6,6-Hexamethylcyclotrisilazane und deren Lithiumsalze (2, 1b, 4) reagieren mit BF3- Etherat zu Silaborazinen (8, 9, 13, 15). Ein BF-verknüpftes Cyclotrisilazane (10) konnte isoliert werden. Substitution am Ring erfolgt in den Reaktionen von 2,2,4,4,6,6-Hexamethyl-1,3-bis(trimethylsilyl)cyclotrisilazan (5) mit BF3-Etherat sowie von 1-Lithio-2,2,4,4,6,6-hexamethylcyclotrisilazan (1a) mit [Bis(trimethylsilyl)amino]difluorboran.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140624
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  • 4
    Electronic Resource
    Electronic Resource
    Substitutions- und Ringkontraktionsreaktionen des lithiierten 1-Trimethylsilyl-2,2,4,4,6,6-hexamethyl-cyclotrisilazans mit Fluorsilanen (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 467 (1980), S. 131-139 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substitution and Ring Contraction Reactions of the Lithiated 1-Trimethylsilyl-2,2,4,4,6,6-hexamethylcyclotrisilazane with FluorosilanesFluorosilyl-substituted cyclotrisilazanes are obtained from reactions of mono- and dilithiated 1-trimethylsilyl-2,2,4,4,6,6-hexamethylcyclotrisilazane with fluorosilanes. Simple substitution of the cyclotrisilazane competes with substitution and ring contraction to form the isomeric cyclodisilazanes. The isomeric four- and sixmembered ring systems are separated by gas chromatography. The n.m.r. and mass spectra of the compounds are reported.
    Notes: Fluorsilylsubstituierte Cyclotrisilazane werden bei Umsetzungen von mono-und dilithiierten 1-Trimethylsilyl-2,2,4,4,6,6-hexamethylcyclotrisilazan mit Fluorsilanen erhalten. In Konkurrenz zur Substitution am Cyclotrisilazan steht in diesen Reaktionen die Substitution und Ringkontraktion unter Bildung strukturisomerer Cyclodisilazane. Die Trennung der isomeren Vier-und Sechsringsysteme erfolgt gaschromatographisch. Die NMR- und Massenspektren der Verbindungen werden mitgeteilt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804670116
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