Butyllithium and tert-Pentyllithium

Since coupling is retained even in the fast exchange limit, the exchange process observed must be intramolecular. Correspondingly, there is no concentration dependence of the exchange rates. 

The k-values between —5 °C (85-100 s ) and —22 °C (3 1 s ) yielded the following values of the overall activation enthalpy AH and activation entropy AS for the fluxonial exchange rates of tetrameric tert-butyllithium in cyclopentane  

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