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Pi-electrons are more polarizable than are sigma-bond electrons field induced pi-electron movement produces strong secondary fields that perturb nearby nucleiThe pi-electrons associated with a benzene ring provide a striking example The electron cloud above and below the plane of the ring circulates in reaction to the external field so as to generate an opposing field at the center of the ring and a supporting field at the edge of the ring. This kind of spatial variation is called anisotropy,
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