W2013CHM2311 Part 5 Notes

They wont this is just an easy and accurate way of

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Unformatted text preview: is aroma9c. If the occupied orbitals are higher in energy than the chain fragments, the ring is an9aroma9c. Cyclobutadiene: An An;aroma;c Ring H H H H C C C C H C C C C H H H Resonance Descrip;on →  All atoms are in the same plane →  The MO diagram for cyclobutadiene’s π- system consists of four unhybridized p- orbitals (one on each carbon atom) connected in a ring. →  Recall that an ethylene group consists of two unhybridized p- orbitals. →  Can develop an MO descrip0on of cyclobutadiene’s π- system by combining the π- systems of two ethylene fragments. Cyclobutadiene π- MO Diagram: Combina0on of Two Ethylene Fragments Cyclobutadiene: An An;aroma;c Ring H H H H C C C C H C C C C H H H Resonance Descrip;on ethylene side view ethylene top view A S Cyclobutadiene π- MO Diagram:...
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