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1979 (1)
1978 (1)
1Author    Volker Böhmer, Klaus WörsdörferRequires cookie*
 Title    Nachbargruppeneffekte bei der Aminolyse von Estern, III Der verlangsamende Einfluß von Triethylamin bei der Aminolyse von 2 -( 2 -Hydroxy benzyl )pheny lacetaten Neighboring Group Effects in the Amino lysis of Esters, III The Rate Diminishing Influence of Triethylamine in the Aminolysis of 2-(2-Hydroxybenzyl)phenylacetates  
 Abstract    The rate of the aminolysis of 2-(2-hydroxybenzyl)phenylacetates with n-butylamine in dioxane is diminished by the addition of triethylamine. This can be quantitatively described by the competitive formation of complexes between monoacetate and n-butyl-amine or triethylamine, if the assumption is made, that the complex with triethylamine is aminolysed slowly or not at all. The neighboring group effect in aminolysis cannot be explained therefore by a base catalysed decomposition of the tetrahedral intermediate. 
  Reference    Z. Naturforsch. 34b, 720—727 (1979); eingegangen am 6. April/23. November 1978/17. Januar 1979 
  Published    1979 
  Keywords    Kinetics, Aminolysis, Neighboring Group Effects, 2-(2-Hydroxybenzyl)phenylacetates, Triethylamine 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0720.pdf 
 Identifier    ZNB-1979-34b-0720 
 Volume    34 
2Author    Volker Böhmer, Klaus WörsdörferRequires cookie*
 Title    Nachbargruppeneffekte bei der Aminolyse von Estern, II Die Aminolyse von 2-(2-Hydroxybenzyl)phenylacetaten Neighboring Group Effects in the Aminolysis of Esters, II The Aminolysis of 2-(2-Hydroxybenzyl)phenylacetates  
 Abstract    The aminolysis of 2-(2-hydroxybenzyl)phenyl acetates with w-butylamine in dioxane is much faster than for the corresponding 2-(2-methoxybenzyl)phenyl acetates or 2-methyl-phenyl acetates. The kinetic results can be explained by two equivalent mechanisms. Both of them include the formation of a l:l-complex between 2-(2-hydroxybenzyl)phenyl acetate and n-butylamine which is formed in an equilibrium. The reaction of this complex according to a second order rate law seems to be more probable than the reaction of the free ester according to a third order rate law. 
  Reference    Z. Naturforsch. 33b, 439—449 (1978); eingegangen am 30. Dezember 1977 
  Published    1978 
  Keywords    Kinetics, Aminolysis, Aprotic Solvent, Neighboring Group Effects, 2 -(2 -Hy droxybenzy 1 )phenylacetates 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0439.pdf 
 Identifier    ZNB-1978-33b-0439 
 Volume    33