The reactivity of organothallium compounds. Kinetics and mechanism of iodination of diarylthallium salts by molecular iodine in dioxane |
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| Authors: | I F Gun'kin K P Butin |
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| Institution: | (1) Technological Institute, Saratov State Technical University, 17 pl. Svobody, 413100 Engel's, Russian Federation;(2) Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119899 Moscow, Russian Federation |
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| Abstract: | The kinetics and mechanism of the reactions of diarylthallium, trifluoroacetates with molecular iodine in dioxane solutions
have been studied. The reaction has the overall second order with the first order with respect to each reagent. The effect
of substituents in the aromatic ring on the rate constant of iodination is described by the equation logk
2ρσ+(ρ=-1.60, r=0.97). The reaction is catalyzed by the iodide ion. The activation enthalpies and entropies of iodination of diarylthallium
trifluoroacetates in dioxane and di(p-anisyl)thallium trifluoroacetate in various solvents have been calculated. The effect of solvents on the rate constant of
iodination of di(p-anisyl)thallium trifluoroacetate has been studied. The reaction mechanism is considered as an electrophilicS
EC process.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 451–455, March, 1999. |
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| Keywords: | organothallium compounds diarlthallium trifluoroacetates iodination iodine reactivity mechanism kinetics |
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