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'Polysilanes' in keywords
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1996 (1)
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1990 (1)
1Author    Wolfram UhligRequires cookie*
 Title    Kaliumgraphit -ein effizientes Reduktionsmittel zur Darstellung von Polysilinen Potassium-Graphite -an Efficient Reducing Agent for the Formation of Polysilynes  
 Abstract    Potassium-graphite (C8K) reduces phenyltrichlorosilane to give polyphenylsilynes in high yields. Branched copolysilanes have been prepared via reductive coupling of phenyltrichlorosi­ lane and diorganodichlorosilanes with C8K. Polymers of this type are also obtained by reductive coupling of triflate substituted polysilanes with C8K. The soluble polymers and copolymers with molecular weights in the range « 4000 to 10000 have been characterized by 29Si-NMR spectroscopy. 
  Reference    Z. Naturforsch. 50b, 1674—1678 (1995); eingegangen am 18. April 1995 
  Published    1995 
  Keywords    Polysilynes, Polysilanes, Potassium-Graphite, Silyltriflates 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1674.pdf 
 Identifier    ZNB-1995-50b-1674 
 Volume    50 
2Author    Wolfram Uhlig, HerrnRequires cookie*
 Title    Zur Darstellung neuer Polysiline und vernetzter Polysilane Synthesis of Novel Polysilynes and Branched Polysilanes  
 Abstract    The reductive coupling of halogenated oligosilanes with potassium-graphite leads to novel polysilynes and branched polysilanes. The ratio of quarternary silicon atoms, monoorganosilyl-and diorganosilylgroups in the polymers can be modified by variation in the structure of the starting materials. In this way the properties of the preceramic polymers (molecular weights, solubility, content of carbon, degree of cross-linking) are influenced. The compounds are characterized by 29Si NMR spectroscopy. 
  Reference    Z. Naturforsch. 51b, 703—710 (1996); eingegangen am 18. Dezember 1995 
  Published    1996 
  Keywords    Polysilanes, Polysilynes, Silyltriflates, Potassium-graphite 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0703.pdf 
 Identifier    ZNB-1996-51b-0703 
 Volume    51 
3Author    Hubert Schmidbaur, Heinz Schuh, ProfRequires cookie*
 Title    Die unterschiedliche Reaktivität von 1,4-Disilabutan und //-Tetrasilan gegenüber sekundären Aminen Differences in Reactivity of 1,4-Disilabutane and //-Tetrasilane towards Secondary Amines  
 Abstract    1,4-Disilabutane H3SiC H 2C H 2S iH 3 (1) and /2-tetrasilane H 3SiSiHUSiH2S iH 3 were employed as model systems for the preparation o f silicon-rich am inosilanes potentially useful for the deposition o f silicon nitride Si3N 4. 1 reacts with the appropriate equivalents o f diethyl-amine in an alkane solvent and in the presence o f the two-phase catalyst N aN H ,/18-crow n-6 to give the products (Et2N)2S iH C fT C H ,S iH 3, (Et2N)2SiH C H 2C H 2S iH 2(N E t2), and (Et2N)^SiHCH,CH1SiH (N E t2)2. By contrast, /z-Si4H 10 undergoes a cleavage reaction under similar conditions to yield H 3S iN E t7 and H 2S i(N E t2) 7 together with a mixture o f polysilanes Si"H7"+2, the com position o f which is depending on the reaction conditions and the nature o f the catalyst (NaH and N a N H 2). Diethylam inopolysilanes are also formed, but only in trace quantities. Treatment o f «-Si4H l0 with pyrrole (C4H 5N) leads to the formation o f trisilane ac­ companied by the pyrrolylsilanes H 1Si(C 4H 4N)^, HSi(C4H4N)3, and Si(C4H4N)4. The differ­ ences in reactivity suggest excellent leaving group properties o f silyl anions in the reaction with amines. 
  Reference    Z. Naturforsch. 45b, 1679—1683 (1990); eingegangen am 8. Juni 1990 
  Published    1990 
  Keywords    Silylamine Reactivity, Polysilylamines, Polysilanes, Silicon Nitride Precursors 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1679.pdf 
 Identifier    ZNB-1990-45b-1679 
 Volume    45