Sigma bonds in conjugated systems have a larger energy barrier to rotation then sigma bonds in non-conjugated systems.

Name: Sigma bonds in conjugated systems have a larger energy barrier to rotation then sigma bonds in non-conjugated systems.
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In conjugated systems, the overlap of p orbitals leads to delocalization of electrons and a stabilization of the molecule, increasing the energy required for rotation around a sigma bond. This is not observed in non-conjugated systems.

Sigma Bonds in Conjugated Systems Have a Larger Energy Barrier