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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, CIV. New Ring Systems Containing Diboron Units: Dithiadisilaboracyclopentanes, Dithiatriborolanes, and DithiatetraborinanesThe pyridine-catalysed comproportionation between the cyclothiasilanes 1 or 4 and the dithiatetrasilacyclohexane 2 yields the dithiatrisilacyclopentane 3. 3 reacts with R2N(Cl)B - B(Cl)NR2 (5), and the R2Si - SiR2 group is specifically eliminated from 3 yielding the dithiasiladiboracyclopentane 6, which is also obtained from 5 and 1 or 4, respectively. Further action of 5 on 6 results in the dimethylamino derivative of a dithiatetraborinane (7). Moreover, a dithiadisilaboracyclopentane (8) results from the S2Si4 system 2 and phenylborane dichloride, and finally, a dithiatriborolane (10) is obtained from 6 and CH3B(SCH3)2. The new heterocyclic compounds were fully characterized chemically and spectroscopically. The X-ray structure analysis of 6 and 7 reveals nonplanar rings with short B — N bonds.
    Notes: Die mit Pyridin katalysierte Komproportionierung der Cyclothiasilane 1 und 4 mit dem Dithiatetrasilacyclohexan 2 liefert das Dithiatrisilacyclopentan 3. Dieses reagiert spezifisch mit R2N(Cl)B - B(Cl)NR2 (5) zu einem Dithiasiladiboracyclopentan (6), ebenfalls erhältlich aus 5 und 1 bzw. 4. Mit weiterem 5 setzt sich 6 zum Dimethylamino-Derivat eines Dithiatetraborinans (7) um. Ein Dithiadisilaboracyclopentan (8) entsteht aus dem S2Si4-System 2 und Phenylbordichlorid, ein Dithiatriborolan-Derivat (10) aus 6 und CH3B(SCH3)2. Die neuen Heterocyclen werden chemisch und spektroskopisch charakterisiert. Die Röntgenstrukturanalyse sicherte für 6 und 7 nichtplanare Ringsysteme mit kurzen B — N-Bindungen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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