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'Ring Contraction' in keywords Facet   Publication Year 1980  [X]
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1Author    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 
2Author    Hans-Ludwig Krauss, Erich HumsRequires cookie*
 Title    Oberflächenverbindungen yon Übergangsmetallen, XXIII [1] Die Umsetzung cyclischer Olefine mit Oberflächen-Chrom(II) auf Silicagel bei höherer Temperatur Surface Compounds of Transition Metals, XXIII [1] The Reaction of Cycloolefines with Surface Chromium (II) on Silicagel at Higher Temperature  
 Abstract    By reaction with surface chromium(II) on silicagel at T > 150 °C, cycloolefins can undergo ring contraction, methylation/demethylation, hydrogenation/dehydrogenation, and iso-meri7ation. Furthermore, n-alkanes (Ci... C4) are formed incorporating support hydrogen. -As in the case of the corresponding acyclic olefins, a common intermediate MC3 (metalla-cyclobutane^HM-allyl complex) for all these reactions is postulated; the transfer of Ci units is claimed to proceed via a carbene M = CH2 derived from the MC3 precursor. 
  Reference    Z. Naturforsch. 35b, 848—854 (1980); eingegangen am 21. Februar 1980 
  Published    1980 
  Keywords    Surface Compounds, Ring Contraction, Methylation/Demethylation, Hydrogenation/Dehydrogenation, Carbene Intermediates 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0848.pdf 
 Identifier    ZNB-1980-35b-0848 
 Volume    35