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'pentamethyldisilane' in keywords
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1996 (2)
1Author    C. Kerst, P. Potzinger, H. Gg, WagnerRequires cookie*
 Title    Reaction of Trimethyl-and Dimethyl-Silyl Radicals with Pentamethyldisilane  
 Abstract    The rate constant for the H atom abstraction of trimethylsilyl radicals from pentamethyldisilane k (4) (&(4)) was measured relative to the trimethylsilyl combination reaction k(3). A value for • ]/k (3) = (8.53±0.08) • 10" 11 cm 3 ' 2 s~ 1/2 was obtained. For the dimethylsilyl radical, a smaller value for the corresponding rate constant ratio (5.9 + 0.2) • 10" 11 cm 3 ' 2 s" 1/2 was measured, and this was attributed to a disproportionation reaction between the dimethylsilyl and the pentamethyldisilyl radical leading to dimethylsilylene. 
  Reference    Z. Naturforsch. 51a, 102—104 (1996); received October 28 1995 
  Published    1996 
  Keywords    Hydrogen abstraction, silyl radicals, pentamethyldisilane, disproportionation reaction 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0102.pdf 
 Identifier    ZNA-1996-51a-0102 
 Volume    51 
2Author    C. Kerst, P. Potzinger, H. Gg, WagnerRequires cookie*
 Title    The Mercury-Sensitized Photolysis of Pentamethyldisilane  
 Abstract    Two primary processes were observed in the Hg-sensitized photolysis of Me 5 Si 2 H: (I) hydrogen abstraction from the Si-H bond with a quantum yield of 0(1) = 0.85, (V) Si-Si bond breaking with 0(V) = 0.04. The hydrogen atoms formed in (/) undergo an H atom abstraction reaction (k(3)), as well as substitution reactions at the Si centers resulting in the formation of dimethylsilane and trimethylsilyl radical (k(4)) or trimethylsilane and dimethylsilyl radical (k(5)). The following branching ratios have been determined: M = 0.87. M 0.096, M = 0.034. k(3) + k(4) + k(5) k(3) + k(4) + k(5) k(3) + k(4) + k(5) The ratio of disproportionation (A: (2)) to combination (£(1)) for the pentamethyldisilyl radical has been determined with MeOH as the scavenger for 1-methyl-l-trimethylsilylsilene, 0.046 < k(2)/ A: C1) < 0.071. A mechanism with pertinent rate constants has been proposed which accounts for the results. 
  Reference    Z. Naturforsch. 51a, 105—115 (1996); received October 28 1995 
  Published    1996 
  Keywords    Hg-sensitized photolysis, pentamethyldisilane, mechanism, substitution reaction, silyl rad-ical disproportionation 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0105.pdf 
 Identifier    ZNA-1996-51a-0105 
 Volume    51