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'Ion Structures' in keywords Facet   Publication Year 1980  [X]
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1980[X]
1Author    Helmut Schwarz, Chrysostomos WesdemiotisRequires cookie*
 Title    -und 2-Methylallylkationen aus isomeren Vinylbromidradikalkationen 1-and 2-Methylallyl Cations from Cation Radicals of Isomeric Vinyl Bromides  
 Abstract    It is demonstrated by collisional activation mass spectrometry that dissociative ionization of E-and Z-l-bromobutene-1 (3, 4), 2-bromo-butene-1 (5) and 2-bromobutene-2 (6) yields exclusively 1-methylallyl cation (a). Unimolec-ular Br -loss from the molecular ion of 1-bromo-2-methylpropene (7) gives rise to the specific formation of the isomeric 2-methylallyl cation (b). Kinetic energy release measurements sup-port the interpretation that Br' loss from the cation radicals 3-7 is preceded (or accompanied) by an exothermic isomerization of the incipient C4Ü7+ ions. 
  Reference    Z. Naturforsch. 35b, 1486—1487 (1980); eingegangen am 18. Juli 1980 
  Published    1980 
  Keywords    Ion Structures, Collisional Activation, Gas Phase Ion Chemistry 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1486_n.pdf 
 Identifier    ZNB-1980-35b-1486_n 
 Volume    35 
2Author    Helmut Schwarz, Chrysostomos Wesdemiotis, Thomas Weiske, Klaus-Peter Zeller, Roland MüllerRequires cookie*
 Title    H. Schwarz et al. * Methyl-Eliminierung aus dem metastabilen Homoadamantan-Radikalkation 219 Methyl Loss from Metastable Homoadamantane Cation Radical  
 Abstract    It is demonstrated that methyl loss from ionized homoadamantane (1) yields exclusively the 1-adamantyl cation (4); there is no experimental evidence for the formation of the secondary adamantyl cation (5). From both model calculations and the investigation of [4-13 C]-homoadamantane (la) and l(13 C-methyl)adamantane (2a) it is concluded, that 24% of the metastable homoadamantane cation radicals dissociate after one isomerization (1 2); the remaining 76% are able to undergo at least a second (degenerate) isomerization cycle (2->l->2) prior to methyl loss. 78% of metastable 1-methyl-adamantane cation radical, obtained upon direct ionization of the corresponding neutral hydrocarbon, dissociate directly, whereas the loss of methyl from the remaining 22% is preceded by an isomerization 2 ->1 ->2. 
  Reference    Z. Naturforsch. 35b, 207—211 (1980); eingegangen am 23. Oktober 1979 
  Published    1980 
  Keywords    Ion Structures, Carbocation Rearrangements, Hydrocarbon Chemistry, Mass Spectrometry, Collisional Activation 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0207.pdf 
 Identifier    ZNB-1980-35b-0207 
 Volume    35