MO for 1,3-Butadiene Lowest energy. bondingbonding bonding ·All bonding interactions. -Electrons are delocalized over four nuclei. Copyright 2010 Pearn Prentice Hall,Inc Chapter 15 8 Chapter 15 8 1 MO for 1,3-Butadiene ▪ Lowest energy. ▪ All bonding interactions. ▪ Electrons are delocalized over four nuclei