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1981 (2)
1Author    Günter Stein, Volker Böhmer, Werner Lötz, Hermann Kämmerer, Fa, Carl Freudenberg, WeinheimRequires cookie*
 Title    Kinetische Untersuchung der Methanolyse von chlormethylierten Phenolen Kinetic Studies of the Methanolysis Reaction of Chloromethylated Phenols  
 Abstract    The solvolysis of 25 differently substituted chloromethylated phenols was studied kinetically in methanol at 25 °C. A sharp decrease of the initial reaction rate with in-creasing concentrations of added acids can be explained by a very fast solvolysis of the phenolate anions in comparison with the undissociated compounds. The latter show strictly first order kinetics up to high conversions and the rate constants can be partly correlated with the Jaffö relation. Highly negative values for the reaction constants Q = —5.4 and q = —6.2 for ortho-and jsara-chloromethylated compounds show, that the undissociated phenols react according to the SNI -mechanism. However, deviations are found for compounds with strongly electron attracting substituents, which may be partly caused by an intramolecular catalytic effect of the phenolic hydroxy group in the case of the ortho-isomers. 
  Reference    Z. Naturforsch. 36b, 231—241 (1981); eingegangen am 10. November 1980 
  Published    1981 
  Keywords    Methanolysis, Chloromethylated Phenols, Anchimeric Assistance 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0231.pdf 
 Identifier    ZNB-1981-36b-0231 
 Volume    36 
2Author    Bernhard Ciommer, Helmut Schwarz, Azzedine Maaroufi, ManfredT. Reetz, Karsten LevsenRequires cookie*
 Title    Silyl-Assistierte Etherspaltung bei Radikalkationen von Hydroxylaminderivaten [1] Silyl-Assisted Ether Cleavage in Radical Cations of Hydroxylamine Derivatives [1]  
 Abstract    It is demonstrad by means of various mass spectrometric techniques that the dissociative ionization of N.N-bis-silylated hydroxylamine derivatives (5 a) and (5 b), giving rise to the cleavage of the (O-C) bond, is anchimerically assisted by migration of the trimethylsilyl group to the ether oxygen, thus generating ion (7). 
  Reference    Z. Naturforsch. 36b, 771—773 (1981); eingegangen am 11. März 1981 
  Published    1981 
  Keywords    Mass Spectrometry, Collisional Activation, Anchimeric Assistance, Silyl Ether 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0771_n.pdf 
 Identifier    ZNB-1981-36b-0771_n 
 Volume    36