Go toArchive
Browse byFacets
Bookbag ( 0 )
'substitution reaction' in keywords
Results  2 Items
Sorted by   
Publication Year
1996 (1)
1979 (1)
1Author    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 
  Similar Items    Find
 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0105.pdf 
 Identifier    ZNA-1996-51a-0105 
 Volume    51 
2Author    Herbert Binder, Jürgen PalmtagRequires cookie*
 Title    Synthesen und Reaktionen von 4-Bora-2.6-diphospha-1.3.5-triazenen Cyclische Borbetaine Synthesis and Reactions of 4-Bora-2,6-diphospha-l,3,5-triazenes Cyclic Boron Betaines  
 Abstract    By substitution of chlorine in the title compound 2,2,4,4,6,6-hexachloro-3,5-dimethyl-4-bora-2,6-diphospha-l,3,5-triazene (1) new members of this class of compounds are synthesized. In most cases reaction starts first on the boron site. The ring reactivity can be accounted for in terms of the charge distribution in the heterocycle 1. In 1 the coupling 2 J(31 P-N-n B) could be detected for the first time. A mechanism for the ring formation is discussed. 
  Reference    Z. Naturforsch. 34b, 179—187 (1979); eingegangen am 15. Juni/4. Oktober 1978 
  Published    1979 
  Keywords    Ring Reactivity, Substitution Reactions, 4-Bora-2, 6-diphospha-l, 3, 5-triazenes 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0179.pdf 
 Identifier    ZNB-1979-34b-0179 
 Volume    34