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A Kinetic Assessment of the Rapid Iodination of Pyrrole in Aqueous Medium by Molecular Iodine using Hydrodynamic Voltammetry

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Author Affiliations

  • 1 Department of Chemistry, Nowrosjee Wadia College, Pune, INDIA

Res.J.chem.sci., Volume 4, Issue (6), Pages 77-81, June,18 (2014)

Abstract

The quantitative study of the rapid of iodination of pyrrole in aqueous medium using molecular iodine at 7 pH has been carried out at five different temperatures. The reaction was found to be very rapid and of second order having a half-life of 40 seconds and velocity constant 5000 M-1 s-1 at 30°C. The rapidity of the reaction necessitated the use of a special technique, hydrodynamic voltammetry, to follow the course of the reaction. The energy of activation , entropy of activation and pre-exponential factor ‘A’ for the reaction are evaluated as 56.16 kJ mol-1 , -64.35 J K-1mol-1and 6.96 x 109 M-1s-1respectively at 30°C and 7 pH. The kinetic and related thermodynamic data obtained elucidate the high reactivity of the heterocycle under study.

References

  1. Bonde S.L., Dangat V.T., Borkar V.T. and Yadav R.P., Rapid Iodination of Xylidines in Aqueous Medium: Kinetic verification of Speculated Reactivities Res.J.chem.sci., 2(6), 1-5 ( 2012)
  2. Naidu A.B., Ganapathy D., Sekar G., Cu (I) Catalysed Intramolecular C (aryl)-Bond Forming Cyclization of the Synthesis of 1,4-Bezodioxins and its Application in Total Synthesis of Sweetening Isovanilines, Synthesis 3509, 2010)
  3. Hernandes M.Z., Cavalcanti S.M.T., Moreira D.R.M., de Azevedo W. F., Jr., Leite A. C. L., Halogen Atoms in the Modern medicinal Chemistry; Hints for the Drug Design, Curr. Drug Targets, 11(3), 303–314, (2010)
  4. Hart E.J. and Boag J.W., Absorption Spectrum for the Hydrated Electron in Water and Aqueous Solutions, J. Amer. Chem. Soc., 84, 4090 (1962)
  5. Rao T.S., Mali S.I. and Dangat V.T., The halogenating agent in hapohalous acid solutions containing Haq, in aromatic substitutions, Tetrahedron, 34, 205 (1978)
  6. Borkar V.T., Dangat V.T., S.L.Bonde S. L., A Quantitative Structure Reactivity Assessment of Phenols by Investigation of Rapid Iodination Kinetics Using Hydrodynamic Voltammetry: Applicability of the Hammett Equation in Aqueous Medium, International Journal of Chemical Kinetics Wiley Pub. (USA) 9 (46), DOI 10.1002/kin.20801, 693-702 (2013)
  7. Dangat.V.T , Bonde S.L., Borkar V.T. and Maske P.D., Rapid Kinetics of Chlorination of Thiophene in Aqueous Medium Using Rotating Platinum Electrode, Res.J. Chem. Sci., 2(7), 75-78(2012)
  8. 8.Pandey Bhawana and Fulekar M.H., Environmental Management- strategies for chemical disaster, Res. J. Chem. sci., 1(1), 111-117 ( 2011)
  9. Cotton F. A., and Wilkinson Advanced Inorganic Chemistry, Wiley Eastern 585, (1972)
  10. Maron S.H.and Prutton C.F., Physical Chemistry, Macmillan Co.,584, (1975)