Factors Affecting E1 Flashcards
Why can E1 reactions occur with weak bases or at low bases?
This is because base type does not affect the rate as the base is not involved in the rate determining step
Sometimes it can act without a base where the solvent can act as the base
Which solvent does E1 favour?
Polar protic is favoured as it solvated the base and the positive carbon which stabilises the intermediate
How does leaving group affect the rate of reaction?
A good leaving group will increase the rate
This is because the rate determining step involves the cleavage of the HX bond so the better the leaving group, the faster the cleavage
What is the saytzeff (zaitsev) rule?
This rule states that the formation of the most highly substituted alkene is favoured
Least number of hydrogens directly attached to the C-C bond
2 structural isomers are formed, most substituted and least, which one is favoured?
The most substituted is favoured as it is lower in energy- saytzeff rule
If the reaction is in dilute or concentration conditions, which reaction is it referring to?
Dilute conditions means SN1
Concentrated conditions means SN2
Which stereochemical conformation is favoured for the transition state and product?
The E conformation is favoured due to the reduction in steric strain as larger groups are further apart
This means E is more stable and lower in energy
This also is true for the transition state as the transition state will be formed faster
