form of the E2 mechanism is as follows:
X = leaving group (usually halide or tosylate)
E2 mechanism, a base abstracts a proton neighboring the leaving
group, forcing the electrons down to make a double bond, and,
in so doing, forcing off the leaving group. When numerous
things happen simultaneously in a mechanism, such as the E2
reaction, it is called a concerted step.
of the E2 reaction:
Strength: A strong base is required since the base is
involved in the rate-determining step.
groups: A good leaving group is required, such as a halide
or a tosylate, since it is involved in the rate-determining
Must occur with antiperiplanar stereochemistry.