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1980 (1)
1976 (1)
1Author    VictorC W Chu, DieterW. GruenwedelRequires cookie*
 Title    On the R eaction o f M ethylm ercuric H ydroxide w ith M ethylcobalam in  
 Abstract    The methylmercury-induced dealkylation of the corrinoid coenzyme methylcobalamin, yielding aquocobalamin and di-methylmercury as products, was studied spectrophotometri-cally at 350 nm using water as a solvent. Rate data were determined for the pH 7 —9 region and also at pH 3.37. Evidence is provided which shows that CH3Hg+ serves as the species which accepts the methyl group and also that Hg2+ is methylated more rapidly than CHsHg+ is. 
  Reference    (Z. Naturforsch. 31c, 753 [1976]; received) 
  Published    1976 
  Keywords    ) Methyl Transfer, Kinetic Studies, Corrinoid Coenzymes, Organomercurials 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0753_n.pdf 
 Identifier    ZNC-1976-31c-0753_n 
 Volume    31 
2Author    DavidW. Allen, J. David, BarrieG. Buckland, HutleyRequires cookie*
 Title    Electronic Effects of Aryl and Heteroaryl Groups on the Rate of Nucleophilic Displacement of Chlorine from 5-Heteroaryl(or Aryl)-2-chloropyrimidines by Piperidine  
 Abstract    The kinetics of nucleophilic displacement of chlorine from a series of 2-chloro-5-hetero-aryl(or aryl)pyrimidines by piperidine have been studied in order to assess the electronic effects of the 5-substituent. The observed order of reactivity is 5-(l-methylpyrrol-2-yl) < 5-7>-anisyl < 5-f>-tolyl < 5-phenyl < 5-(2-thienyl) < 5-(2-furyl) < 5-(m-chlorophenyl). The reactions are enthalpy-controlled and the rate data can be explained as a consequence of the electron-withdrawing or electron-donating ability of the 5-substituent. Synthetic routes to the compounds studied are also described. 
  Reference    Z. Naturforsch. 35b, 463—467 (1980); received November 19 1979 
  Published    1980 
  Keywords    5-Substituted Pyrimidines, Nucleophilic Displacement, Kinetic Studies, Heteroaryl Substituents 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0463.pdf 
 Identifier    ZNB-1980-35b-0463 
 Volume    35