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Unformatted text preview: 3. allylic unshared electron pairs contribute two electrons to the pi electron count if they occuy an orbital that is parallel to the other p oribitals in the molecule 4. an atom with na empty p orbital can be part of a continuous aromatic pi elertorn system and not contribute any pi electrons if allylic lone pairs are outside ring they are in p orbitals antiaromatic compounds that contain planar, continuous rings of 4n pi electrons are especially unstable...
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- Spring '11