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1983 (1)
1979 (1)
1975 (1)
1Author    Michael Hesse, Uwe Klingebiel, Jürgen Heinze, John MortensenRequires cookie*
 Title    Oxidation of 4-Lithium-diazasilacyclopentene with Transition Metal Halides  
 Abstract    4-Lithium-3,3,5-trimethyl-2-ter^-butyl-l,2-diaza-3-sila-5-cyclopentene is oxidized in the reaction with transition metal halides and subsequently dimerizes. Oxidation potentials are given and a reaction mechanism is proposed. 
  Reference    Z. Naturforsch. 38b, 953—954 (1983); eingegangen am 2. Mai 1983 
  Published    1983 
  Keywords    Diazasilacyclopentene, Oxidation Potential, Dimerisation 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0953.pdf 
 Identifier    ZNB-1983-38b-0953 
 Volume    38 
2Author    J. R., D. B., F. K.Requires cookie*
 Title    High Pressure Reactions, IX 1 Isomerizations at High Pressures  
 Abstract    Cyclooctatetraene dimerises at high pres­ sure (12 Kbar, 20 °C) to the isomers 2 and 3. At 120 °C compound 2 isomerises quanti­ tatively to compound 3. The conversion rate of Hexamethyldewarbenzene to Hexamethyl-benzene at high pressures depends on kind of solvent, whereas the influence of tempera­ ture is small in the range between 2 0 ° and ' 80 °C. 
  Reference    (Z. Naturforsch. 30b, 290 [1975]; eingegangen am 17. Oktober 1974) 
  Published    1975 
  Keywords    High Pressure, Cyclooctatetraene, Dimerisation, Hexamethyldewarbenzene, Isomerization 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0290_n.pdf 
 Identifier    ZNB-1975-30b-0290_n 
 Volume    30 
3Author    Reiner Luckenbach, Nikolaus MüllerRequires cookie*
 Title    Zur elektrocyclischen Ringöffnung von Cyclopropylhalogeniden bei der Reaktion mit Natriumiodid in Aceton Electrocyclic Ring Opening of Cyclopropyl Halides in the Course of their Reaction with Sodium Iodide in Acetone  
 Abstract    Reaction of cyclopropyl halides with sodium iodide in acetone [i.e. under typical Sis-2-conditions), proceeds via ring opening to allylic systems finally yielding 1,5-hexadienes upon dimerisation; ring-retained products were not detected. Application of the Wood-ward-Hoffmann rules lends strong support to a cationic synchronous mechanism. This is also confirmed by kinetic measurements proving this reaction to be first order over all. The kinetic data are shown to fit the Hammett equation using cr-values for cyclopropyl bromides and o + -values for geminal cyclopropyl dichlorides, respectively. The validity of the Woodward-Hoffmann-De Puyrule (according to which in synchronous reactions leaving groups situated endo are strongly favored over those situated exo) is tested in corresponding experiments involving condensed ring systems. I. Zum Problem der nukleophilen Substitution an Cyclopropylsystemen In der vorliegenden Arbeit werden die Reaktionen von 2-phenylsubstituierten Cyclopropylhalogeniden unter typischen SN2-Bedingungen (Umsetzung mit Natriumiodid in Aceton) untersucht. Zunächst 
  Reference    Z. Naturforsch. 34b, 464—480 (1979); eingegangen am 10. August/19. Dezember 1978 
  Published    1979 
  Keywords    Ring Opening, Woodward-Hoffmann Rules, Allylic Cations, Dimerisation, 1, 5-Hexadienes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0464.pdf 
 Identifier    ZNB-1979-34b-0464 
 Volume    34