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Bromination of an alkene by N-bromosuccinimide (NBS) in the presence of light or peroxide is a...

Bromination of an alkene by N-bromosuccinimide (NBS) in the presence of light or peroxide is a radical reaction and produces an allylic bromide. For the following bromination of 3-methylcyclopentene, select the allylic bromides from the set at the right that would be products of the reaction.

Bromination of an alkene by N-bromosuccinimide (NB

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Concepts and reason

This problem is based on the concept of allylic bromination.

Allylic bromination of Alkenes can occur on reaction of alkene with N-Bromo-succinimide in presence of light.

Fundamentals

The carbon adjacent to the double bond is called as allylic carbon. These carbons undergo allylic halogenations via free radical mechanism.

In the given molecule, there are 2 allylic carbons, hence more than 1 product will be formed.

allylic positions.

The reactions with respect to the first radical position are given below:

Br
- HBr
BI2
Br2
Br

The reactions with respect to the first radical position are given below:

-
H
占全-
| Br.
- HBr
d
Br2
Bro
>

Ans:

The possible allylic brominated products are given below:

Br
-Br

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