Chapter 21, Problem 21.62P

Interpretation Introduction

Interpretation: A stepwise synthesis to convert cyclopentanone and $\text{4-bromobutanal}$ to hydroxyl aldehyde A is to be stated.

Concept introduction: Acetals are the groups in which carbon atom is bonded to two $\text{OR}$ groups through single bonds. They are used as protecting groups as they are stable enough in neutral to strong basic condition.