Conformations of 1.3-Butadiene The s-trans conformer is more stable than the s-cis by 12 kJ/mol (2.8 kcal/mol). Easily interconvert at room temperature. s-trans s-cis H Chapter 15 13Chapter 15 13 Conformations of 1,3-Butadiene ▪ The s-trans conformer is more stable than the s-cis by 12 kJ/mol (2.8 kcal/mol). ▪ Easily interconvert at room temperature. H H H H H H s -trans s -cis H H H H H H