Transition Metal Chemistry

, Volume 7, Issue 4, pp 204–206 | Cite as

Reactions of coordinated ligands, Part III(1). Kinetics of lodination of malonate and pyruvate in malonato(pentaammine)-cobalt(III), malonato-bis-(ethylenediamine)cobalt(III) and pyruvato(pentaammine)cobalt(III) ions

  • Anadi C. Dash
  • Nivedita Mullick
  • Rabindra K. Nanda
Full Papers

Summary

The kinetics of iodination of malonate and pyruvate in the title complexes are reported at 35.0 °C and I=0.3 M. The reaction is first order in substrate and zeroth order in [I2]. This result is commensurate with rate determining enolisation of the active methylene and methyl groups of the malonate and pyruvate respectively. The reaction is catalysed by H2O, OH and by the buffer anions used. The rate data suggest that the malonate methylene group in the [Co(en)2-O2CCH2CO2]2+ chelate is considerably more active towards electrophilic substitution than is the case in [Co(NH3)5O2CCH2CO2]2+.

Keywords

Methylene Physical Chemistry Cobalt Inorganic Chemistry Pyruvate 

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Copyright information

© Verlag Chemie GmbH 1982

Authors and Affiliations

  • Anadi C. Dash
    • 1
  • Nivedita Mullick
    • 1
  • Rabindra K. Nanda
    • 1
  1. 1.Department of ChemistryUtkal UniversityBhubaneswarIndia

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