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π Molecular Orbitals
Orbitals formed by the overlap of p-orbitals across adjacent atoms, involved in pi bonding, crucial for the understanding of conjugated systems.
Occupied π Molecular Orbitals
π molecular orbitals that contain electrons; they are involved in bonding between atoms and are crucial for understanding the reactivity of molecules.
Cyclobutadiene
A highly unstable, conjugated diene with the molecular formula C4H4, characterized by a square planar structure that challenges classical bonding theories.
[4]annulene
A cyclic compound made up of four conjugated carbon atoms, known for its planar structure and aromatic behavior despite having 4 π-electrons, which does not follow Huckel's rule for aromatic stability.
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