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'Cyclotrisilazanes' in keywords
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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    William Clegg, Michael Hesse, Uwe Klingebiel, GeorgeM. Sheldrick, Lutz SkodaRequires cookie*
 Title    Ringkontraktion am Cyclotrisilazan -System - Synthese und Molekülstrukturen zweifach silylverknüpfter Cyclodisilazane Ring Contraction in the Cyclotrisilazane System - Synthesis and Molecular Structures of Silyl-Bridged Cyclodisilazanes  
 Abstract    l-(Fluorodiorganylsilyl)-2,2,4,4,6,6-hexamethyl-3-(trimethylsilyl)cyclotrisilazanes react with butyllithium to give the corresponding lithium salts. Ring contraction of the lithium salts with formation of lithiated (fluorodiorganylsilyl)amino-substituted four-membered rings is observed in THF solution. The dimerisation of these cyclodisilazanes with elimina-tion of LiF is demonstrated by crystal structure determinations of three products. Monoclinic and triclinic crystalline modifications of one compound could be isolated. 
  Reference    Z. Naturforsch. 35b, 1359—1365 (1980); eingegangen am 29. Juli 1980 
  Published    1980 
  Keywords    Cyclotrisilazanes, Ring Contraction, Cyclodisilazanes, Crystal Structures 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1359.pdf 
 Identifier    ZNB-1980-35b-1359 
 Volume    35 
3Author    Kerstin Dippel, Uwe KlingebielRequires cookie*
 Title    Kontraktionsreaktionen lithiierter Cyclotetrasilazane zu Cyclotri-und Cyclodisilazanen C ontraction Reactions of Lithiated Cyclotetrasilazanes Yielding Cyclotri-and Cyclodisilazanes  
 Abstract    The lithium derivate o f the octamethylcyclotetrasilazane 1 reacts with fluorosilanes with substitution (2) or substitution and contraction to give cyclotrisilazanes (3 —6). Lithiated 6 again reacts with substitution (7, 11, 12) or substitution and isomerization to give l,3 -(S i-N -S i) substituted cyclodisilazanes (8 , 13). Starting with the dilithiated eight mem-bered ring (14) the reactions with fluorosilanes lead to the formation o f the unsymmetrically l-(S i)-3 -(S i-N -S i-N -S i)-s u b s titu te d four mem bered rings (9, 10). The isomerization o f the lithium salts depends on thermal, thermodynamic and kinetic effects. 
  Reference    Z. Naturforsch. 45b, 1147—1154 (1990); eingegangen am 26. Januar 1990 
  Published    1990 
  Keywords    Cyclotetrasilazane, Lithium Salts, Isomerization, Cyclodisilazanes, Cyclotrisilazanes 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1147.pdf 
 Identifier    ZNB-1990-45b-1147 
 Volume    45