Question

Question: Propose mechanisms to account for the observed products in the following reactions.

b)

Short answer

b)

Step-by-step solution

Step 1:

The bromination reaction is the process by which one or more bromine atoms are added to a chemical. Halogination reaction includes bromination reactions. N-bromosuccinimide, also known as NBS (sourse of Br), is employed in this reaction as a reagent to aid in radical substitution.

A free radical is a molecule that lacks charge and has an unpaired electron. Free radicals are extremely reactive substances with a brief shelf life.

b)

The reagent NBS, which produces a bromine radical as a result, first undergoes radical production. (Refer:971371-6-57P-a)

Following that, a free radical is formed in the alkene, producing an allylic free radical as a byproduct. The potential mechanism to explain the observed products in the described reaction between an alkene and NBS is presented.

Step 3:

The resonance of the allylic radical results in the formation of two products by the specified reactants. Due to the homoannular nature of the double bond, the product with the red shade is the main product.