Abstract-Theproton exchange reaction between the indenyl carbanion and its parent compound indene has been studied by N M R as a function of temperature. The rate of this bimolecular reaction is very low and has been found to be strongly dependent on the polarity of the solvent. In solvents like diniethoxyethane (( ~~ 7.2) and diglyme the reaction becomes manifest in the N M R spectrum only at elevated temperatures ( T > 150°C). In hexamethylphosphortriamide (E = 30) the rate is much greater and line broadening may be observable at room temperature. The reaction in this solvent is characterised by a frequency factor , f = : 7 x 10' I mol ~1 s~', an activation enthalpy AH' --9.5 kcal mol-I and an entropy of activation 4s' : -23 e.u. The low reaction rate and its solvent dependence are briefly discussed.
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