Isobutyl Groups H H C-H C-H H H H H H-C一C一C一H H-C一C H C- H H H H H isobutyl tert-butyl A primary carbon A tertiary carbon => Chapter 3 12Chapter 3 12 Isobutyl Groups H C H H C C H H C H H H H H C H H C C H H C H H H H H H A primary carbon A tertiary carbon => isobutyl tert-butyl