MO for 1,3-Butadiene and Ethylene butadiene ethylene The bonding MOs of both 1,3-butadiene and ethylene are filled and the antibonding MOs are empty. p orbital ·Butadiene has lower energy than ethylene. This lower energy is the resonance stabilization of the conjugated diene. Copyright 2010 Pearson Prentice Hall,Inc Chapter 15 12 Chapter 15 12 MO for 1,3-Butadiene and Ethylene ▪ The bonding MOs of both 1,3-butadiene and ethylene are filled and the antibonding MOs are empty. ▪ Butadiene has lower energy than ethylene. ▪ This lower energy is the resonance stabilization of the conjugated diene