Question
The major products A and B formed in the following reaction sequence are:
The correct answer is
Let's analyze the reaction sequence given in the image:
- The first step involves the reduction of the nitro group \(\text{NO}_2\) to an amino group \(\text{NH}_2\) using Zinc (Zn) and NaOH. This is a common reaction where the nitroarene is reduced to an aniline derivative.
- Thus, compound A will have a \(\text{NH}_2\) group at the position where the nitro group was originally located.
- Next, compound A is treated with aqueous HCl, which will lead to deprotection or hydrolysis of the protecting group \(\text{OPr}\) (propyl group), forming a phenol group \(\text{OH}\).
Therefore, the major products A and B in the given reaction sequence will be:
This corresponds to the correct answer, where product A is the amine, and product B is the phenol.
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Important Questions from Heterocyclic Compounds
- Compound A on Hofmann exhaustive N-methylation procedure (involving two cycles), followed by ozonolysis (i. $O_3$; ii. $Me_2S$) gives benzaldehyde, formaldehyde and 2,2-dimethylpropanedial. The structure of A is
- Isoquinoline on sequential reaction with benzoyl chloride and KCN followed by heating with aq. NaOH gives
- The major product formed in the reaction of indole with NaNH$_2$ and PhSO$_2$Cl is
The correct order of basicity for the following heterocycles is
The major product formed in the following reaction is
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