Summary
Conjugated dienes exhibit enhanced stability due to the delocalization of p electrons and the formation of bonding molecular orbitals with partial double-bond character, as explained by molecular orbital theory. Their reactivity in electrophilic addition reactions is dictated by the formation of resonance-stabilized allylic carbocations, leading to different addition products under kinetic and thermodynamic conditions. The Diels–Alder cycloaddition is a powerful tool in forming cyclic structures, requiring the diene to adopt an s-cis conformation for a concerted reaction. UV spectroscopy serves as an essential tool for investigating the electronic transitions in conjugated systems and thereby determining their structure and concentration. Additionally, the polymerization of dienes is fundamental to the production of both natural and synthetic rubbers.