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1987 (1)
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1Author    Detlev Enterling, Uwe Klingebiel, Anton MelierRequires cookie*
 Title    Substitution und Ringkopplung am Cyclotrisilazan-System Substitution and Ring Coupling at the Cyclotrisilazane System  
  Reference    Z. Naturforsch. 33b, 527—532 (1978); eingegangen am 9. Januar/21. Februar 1978 
  Published    1978 
  Keywords    Cyclotrisilazanes, Substitution, Fluorosilanes, Ring Coupling, Borazine 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0527.pdf 
 Identifier    ZNB-1978-33b-0527 
 Volume    33 
2Author    Uwe Klingebiel, Lutz SkodaRequires cookie*
 Title    Fluoroboryl-and Fluoroboranediyl-Cyclosilazanes  
 Abstract    Hexamethylcyclotrisilazanes and their lithium salts react with F2BN(SiMe3)2 to give the corres­ ponding mono-, bis-, and tris(fluoroboryl)cyclotrisilazanes. Di-fluoroboryl-substituted rings are obtained in the reaction of l,3-bis(silyl)-and 1-boryl-cyclotrisilazanes with BF3-etherate. A com­ pound consisting of two cyclodisilazanes connected by a (SiNBNSi)-bridge is formed in the reaction of lithiated bis(silyl)cyclotrisilazane with BF3-etherate. Ring coupling of two six mem-bered rings occurs in the reaction of lithiated cyclotrisilazane with 1-difluoroboryl-cyclotrisilazane and in the reaction of lithiated bis(fluoroboryl)cyclotrisilazane with BF3-etherate in a molar ratio 2:1. Ring expansion takes place in the reaction of the lithium salt of a four membered SiN-ring with F2BN(SiMe3)2. Substitution occurs in the same reaction with F3SiN(SiMe3)2. 
  Reference    Z. Naturforsch. 40b, 913—918 (1985); eingegangen am 16. März 1985 
  Published    1985 
  Keywords    Cyclosilazanes, Fluoroboranes, Boryl Substitution, Ring Coupling, Ring Expansion 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0913.pdf 
 Identifier    ZNB-1985-40b-0913 
 Volume    40 
3Author    Ernst Egert, Ursula Kliebisch, Uwe Klingebiel, Dieter SchmidtRequires cookie*
 Title    Cyclodi-und -trisilazane — Synthese, Reaktionen und Ringkopplungen Cyclodi-and -trisilazanes — Synthesis, Reactions and Ring Coupling  
 Abstract    Contrary to our expectations, a cyclotrisilazane is obtained instead of a cyclodisilazane by the reaction of the lithiated di-rerf-butyldiamino-silane with Hal 2 SiMe 2 . Mono-and disubstitution takes place in reactions of lithiated tetra-isopropyl cyclodisilazane with halogeno-silanes and -boranes. A disubstituted ring reacts with LiOC 4 H 9 -formed from LiC 4 H y and THF — to give an unsymmetrically substituted four-membered ring as proved by a crystal structure determination. Coupling of four-and six-membered rings occurs in the reaction of SiF-substituted and lithiated rings. 
  Reference    (Z. Naturforsch. 42b, 23—30 [1987]; eingegangen am 1. September 1986) 
  Published    1987 
  Keywords    Cyclosilazanes, Substitution, Ring Coupling, Crystal Structure 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0023.pdf 
 Identifier    ZNB-1987-42b-0023 
 Volume    42