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8.10 a) CH₃ CH₃ H -- /+ Ph C H + H-!: Ph-C-O-H + : I CH₃ CH₃ CH₃ Ph CH₃ H -- C Ph C+ + H CH₃ : I: CH₃ b) CH₃ Free Energy (G) CH₃ I CH₃ Ph-C-OH CH₃ CH₃ HI Reaction Progress 8.11 a) Because the leaving group is on a tertiary carbon, the reaction proceeds by an SN1 mechanism. The rate determining step is the formation of the carbocation intermediate, so the reactivity of the nucleophile does not affect the rate of an SN1 reaction. Therefore both reactions proceed at the same rate. 111