Chapter 7, Problem 7.57P

Interpretation Introduction

Interpretation:

The curved arrow notation and products for each elementary step described by the given sequence are to be drawn.

Concept introduction:

The curved arrow can be drawn from electron-rich site to an electron-poor site to show the flow of electron from electron-rich site to electron-poor site. The first curved arrow drawn from the lone pair of negatively charged atom of electron-rich site to the less electronegative atom of electron-poor site. The second curved arrow drawn from the region between the less electronegative atom and more electronegative atom towards the more electronegative atom indicating the breaking of bond.

The elementary step in which a species containing a nonpolar $\text{π}$ bond (as part of a double or triple bond) approaches a strongly electron-deficient species is called electrophillic addition reaction.

In electrophilic elimination reaction the electrophile is eliminated from the carbocation, generating a stable, uncharged, organic species by forming $\text{C=C}$ bond.

In a $\text{1, 2-}$ alkyl shift, a $\text{C}-\text{H}$ or $\text{C}-\text{C}$ bond adjacent to a carbocation is broken, and the bond is reformed to the C atom initially with the positive charge. The positive charge moves to the C atom whose bond is broken.