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'Mechanism' in keywords Facet   Publication Year 1975  [X]
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1975[X]
1Author    M. Iv E, A.F M, F. D.Requires cookie*
 Title    Thiol Ester Aminolysis in Acetonitrile  
 Abstract    The kinetics of the reactions of p-nitro -phenyl thiolacetate with several amines in acetonitrile was studied. Hydrazine exhibits considerably greater nucleophilicity than expected from its pKa value. Common mech­ anism is suggested for the aminolysis of the thiol ester and its oxygen analogue. 
  Reference    (Z. Naturforsch. 30b, 138 [1975]; received September 30 1974) 
  Published    1975 
  Keywords    Thiol Ester, Aminolysis, Kinetics, Mechanism, Alpha Effect 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0138_n.pdf 
 Identifier    ZNB-1975-30b-0138_n 
 Volume    30 
2Author    S.Requires cookie*
 Title    Kinetics and Possible Mechanisms o f the Ce(IY) Oxidation of EDTA, CDTA, DTPA and NTA in Perchloric Acid Media  
 Abstract    a m ir B. H a n n a , W i l l i a m R . C a r r o l l , S a l e m A. A t t i g a , a n d W i l l i a m H . W e b b The rates of oxidation of four chelating agents with Ce(IV) in HC104 solutions, have been studied by the stopped-flow technique. The rates first increase with increasing acidity, reach maxima which are characteristic of the chelating agent and the medium, then progressively decrease with further increasing acid concentration. A t their maximum reactivities, the tendencies for oxidation decrease in the following order: 2rans-l,2-dia-minocyclohexane tetraacetic acid (CDTA) > ethylenedinitrilotetraacetic acid (EDTA) > diethylenetriaminepentaacetic acid (DTPA) > nitrilotriacetic acid (NTA). A mech­ anism for the oxidation of EDTA, involving Ce4+ and Ce(OH)3+ and both unprotonated and monoprotonated chelating agent, is proposed. 
  Reference    (Z. Naturforsch. 30b, 409—415 [1975]; received December 27 1974) 
  Published    1975 
  Keywords    Oxidation, Amino Acids, Kinetics, Mechanisms, Cerium(IY) 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0409.pdf 
 Identifier    ZNB-1975-30b-0409 
 Volume    30