Chapter 12, Problem 12.1YT

Interpretation Introduction

Interpretation:

To find out how many single bonds each C atom has and how many bonds a double bond represents.

Concept introduction:

If the electrophilic atom on the electrophile has a lone pair of electrons, then addition can take place in a way that avoids losing an octet. E represents a generic electrophile that possesses a lone pair of electrons. Two new E-C σ bonds are formed simultaneously to produce a three-membered ring. One of those is formed by the electrons from the initial carbon-carbon π bond, and the other is formed by the lone pair of electrons from the electrophile.