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Image for Add two curved arrows to the reactant side to illustrate the movement of electrons in the E2 reaction below. (

Add two curved arrows to the reactant side to illustrate the movement of electrons in the E2 reaction below. (There will be a total of three curved arrows, one of which is drawn for you.)

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Answer #1
Concepts and reason

The reactants and products of E2 reaction are given. The curved arrow mechanism needed to be depicted. The electron movement happens in such a way so that the incoming base extracts a proton and the removal of leaving group takes place.

Fundamentals

E2 reaction: It stands for elimination reaction following second order kinetics. In E2 reaction, the base abstracts the β\beta hydrogen and removal of the leaving group simultaneously in the same step. A general mechanism is shown below:

H
B
R,
-CH,
+ BH +
x
X is the leaving group
B is the base

The base is the hydroxyl ion and the leaving group is bromine as shown below:

CH, H
HC
H3C2
og
-CH, . :0—H
CH,* ;;—H
Br:
Br:
Leaving group
Base

The curved arrows are as follows:

ÇHz H
HC
H3CA
CH + :0-H
—
CH, +
0-
H
+
Br:
HzĆ

Ans:

The curved arrows are as follows:

ÇHz H
HC
H3CA
CH + :0-H
—
CH, +
0-
H
+
Br:
HzĆ

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