The Kinetics of the Reaction of Bis(Pentamethylcyclopentadienyl)-Methylscandocene With Benzene (D=6)
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The deuterium isotope effect on the observed rate of the reaction of bis(pentamethylcyclopentadienyl)methylscandocene with benzene, C6H6, supports a four-center, [2s-2s], transition state. In addition, the Fourier transform deuterium NMR as well as H-NMR indicate the formation of a tuck-in intermediate. The free energy changes of activations for the transition states in the rate-determining steps of these two competing path-ways, at different temperatures, suggest that the four-center transition state, having a higher entropy of activation than that of the transition state which leads to the formation of the tuck-in intermediate, is favored at low temperatures. However, at high temperatures both path-ways are followed equally. This observation is further supported by the relative percentages of the formation of methane D=l and methane D=O, at different temperatures.If you are not a current K College student, faculty, or staff member, email email@example.com to request access to this SIP.