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  • 1
    Electronic Resource
    Electronic Resource
    On the formation of permethylcyclopolysilanes in the würtz-type reaction of Me2SiCl2: The influence of solvent and complexing agent (1995)
    Springer
    Journal of inorganic and organometallic polymers and materials 5 (1995), S. 163-168 
    Details
    ISSN: 1572-8870
    Keywords: Polysilanes ; cyclopolysilanes ; solvated electron ; crown ether
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Permethylcyclopolysilanes are most often prepared by Würtz-type coupling of Me2SiCl2 with Na K alloy in THI: When nonpolar solvents like benzene were used, only linear polysilanes (Me2Si)n were produced, but the addition of a catalytic amount of crown ether 18-crown-6 was found to increase significantly the amount of cyclic oligomers. The ratio of (Me2Si)6 to (Me2Si)5 decreased from 18:1 to 6:1 in the presence of crown ether in a typical synthesis in THF. An explanation based on solvated electron theory has been proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058144
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  • 2
    Electronic Resource
    Electronic Resource
    Chlorides of antimony and tin as reagents for syntheses of cyclic and linear Chloropermethylpolysilanes (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 229-232 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of c-Si6Me12 with SbCl5 proceeds with cleavage of the methyl groups from silicon and gives c-ClSi6Me11 and c-Cl2Si6Me10 as main products. The molar ratio of those compounds depends on solvent. The same chlorodemethylation reaction takes place if c-Si6Me12 reacts with GaCl3.The reaction with SnCl4 proceeds with cleavage of the Si—Si bonds of polysilane and α,ω-dichloropermethylpolysilanes, with the 1,6-Cl2Si6Me12 as the main product, are formed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320214
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    Paper (German National Licenses)
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