Welcome to E2 Reactions Made Easy!
By: Joanna Grant, Alexis McLean, & Jessica Watts
What is an elimination reaction? A halogen is removed from one carbon A hydrogen is removed from an adjacent carbon A double bond is formed between the two carbons where the atoms were eliminated
Two Types of Elimination Reactions
E1 reaction: - stepwise - unimolecular rate=k[R-X] - leaving group leaves on its own - C+ intermediate
E2 reaction: - Concerted -Biomolecular rate=k[R-X][base] - leaving group leaves at the same timethe base removes a H+ from the beta carbon
We'll focus on E2
What are Elimination Reactions
1. Beta hydrogen
2. Base 3. Alkyl Halide
An E2 Reaction
Feel free to pause the video here to get a closer look!
Competition between E1 & E2
1. Degree of saturation 2. Base strength 3. Solvent used
Competition depends on :
When E2 is favored over E1 :
1. Primary and secondary (controversial) saturated alkyl halide 2. Stong base (OH or better) 3. Polar Aprotic Solvent
Now lets see an example!