Question

Give the major product(s) for the following reacti

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Answer #1
Concepts and reason

The concept is to draw the major organic products, when diene reacts with low concentrated halogens.

Fundamentals

Alkenes and dienes react with low concentrated halogens to form allylic halogen substituted products. This reaction is carried through free radical mechanism. Allylic carbon-hydrogen bonds are weak. So, they easily cleave to form radicals.

The reaction is,

ama
01-
01
Low cone) +
(Low conc.)
НСІ
.
(E)-penta-1,3-diene
1° allylic radical
2° allylic radical

The reaction is,

CI
1° allylic radical
(E)-5-chloropenta-1,3-diene
20 allylic radical
3-chloropenta-1,4-diene

Ans:

Thus, the major organic products are,

m
.my
(E)-5-chloropenta-1,3-diene
3-chloropenta-1,4-diene

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