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'Keto enol Tautomerism' in keywords
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1981 (1)
1979 (1)
1Author    Giorgio Malesani, Ugo Quintily, Gianfranco ChiarelottoRequires cookie*
 Title    345 G. Malesani et al. * Keto-enol Tautomerism in 4,7-Dioxo-4,5,6,7-tetrahydroindoles  
 Abstract    The tautomeric equilibria of 4,7-dioxo-4,5,6,7-tetrahydroindoles have been investigated by nuclear magnetic resonance spectroscopy. Proton chemical shift measurements have been made for a series of alkyl or arylindole derivatives, and equilibrium constants ([enol]/[keto]) have been determined. The effect of solvent on the enol-keto equilibria has been studied. 
  Reference    Z. Naturforsch. 34b, 333—338 (1979); received September 8 1978 
  Published    1979 
  Keywords    Keto-enol Tautomerism, 4, 7-Dioxo-4, 5, 6, 7-tetrahydroindoles, 4, 7-Dihydroxyindole Derivatives 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0333.pdf 
 Identifier    ZNB-1979-34b-0333 
 Volume    34 
2Author    Bernd Richter, Helmut SchwarzRequires cookie*
 Title    Zur McLafferty-Umlagerung bei Radikalkationen von Phenylpyridylalkanonen [1] On the McLafferty Rearrangement of Ionized Phenyl Pyridyl Alkanones [1]  
 Abstract    A detailed investigation concerning the genesis of McLafferty rearrangement products from molecular ions of phenyl pyridyl alkanones reveals the following features: 1) The various products are not formed by competitive dissociations of the molecular ion. Most of the relevant fragment ions are generated from the primary McLafferty product of a hydrogen transfer to the ionized carbonyl group (M +> ->m/z 163, ion k). The ion k plays a decisive role for the generation of the abundant product ions at m/z 93 (ion g) and m/z 106 (ion s) both of which are formed by further dissociation of k. Details of the mechanisms for the decomposition of k are obtained by investigating [D]-labelled isotopomers, the analysis of low and high resolution data, the application of MIKE and CA spectra. The problem of keto/enol tautomerism between some ions, relevant in this context, is discussed and it is shown that these isomerization processes are not involved. A detaüed description is given for the syntheses of various [D]-labelled phenyl pyridyl alkanones. 
  Reference    Z. Naturforsch. 36b, 865—877 (1981); eingegangen am 16. Dezember 1980 
  Published    1981 
  Keywords    Mass Spectrometry, Hydrogen Rearrangement, Keto Enol Tautomerism, Metastable Ions, Collisional Activation 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0865.pdf 
 Identifier    ZNB-1981-36b-0865 
 Volume    36