What are elimination reactions?
In general, an elimination reaction (specifically, it's called
Note that they don't necessarily all happen in one step.
We have a first-order and a second-order process associated with elimination. These are called
E1 REACTIONS vs. E2 REACTIONS
Some examples can be seen below.
The key features of these two are:
- A proton from the
#beta#carbon leaves, forming a #pi#bond across a carbon-carbon bond such that the most substituted product is made (Zaitsev's Rule).
- Favorable at higher temperatures.
- Favorable for higher steric hindrance on the electrophile and/or nucleophile.
The key differences are:
#"E"1#has no need for an antiperiplanar orientation, but #"E"2#does. #"E"1#has a carbocation intermediate, which allows for 1,2-hydride shifts or 1,2-alkyl shifts, but #"E"2#does not have or allow either.
WHEN YOU HAVE A POOR LEAVING GROUP