Chemca Chemistry Made Easy
E1 Elimination Simulation
Concept Quiz
The E1 Mechanism
The E1 (Elimination Unimolecular) reaction is a two-step process that competes with the SN1 mechanism. It proceeds via the exact same rate-determining step: the formation of a carbocation. However, instead of a nucleophile attacking the carbon, a weak base extracts a proton from an adjacent ($\beta$) carbon, resulting in a $\pi$ double bond.
Rate $= k [\text{Substrate}]$
(Independent of Base Concentration)
(Independent of Base Concentration)
Zaitsev's Rule:
Because the intermediate is a freely rotating carbocation, the system will thermodynamically favor the removal of a proton that leads to the most substituted, most stable alkene. E1 reactions do not have a strict anti-periplanar geometrical requirement like E2 reactions.
Because the intermediate is a freely rotating carbocation, the system will thermodynamically favor the removal of a proton that leads to the most substituted, most stable alkene. E1 reactions do not have a strict anti-periplanar geometrical requirement like E2 reactions.
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