ORGANIC CHEMISTRY Chapter l 1. 13A Restricted Rotation and the Double bond o There is a large energy barrier to rotation associated with groups joined by a double bond (264kJ/mo) 90° C otation H H H H Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 1 1.13A Restricted Rotation and the Double Bond There is a large energy barrier to rotation associated with groups joined by a double bond. (264 kJ/mol) C C H H H H C C H H H H 90° rotation