Chapter 27, Problem 27.43P

Interpretation Introduction

Interpretation: The preparation of X from a constitutional isomer by a series of $\left[2+2\right]$ cycloaddition reaction is to be predicted.

Concept introduction: Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Electrocyclic reactions involve the conversion of $\text{σ}$ bonds into $\text{π}$ bonds or $\text{π}$ bonds into $\text{σ}$ bonds.