Chapter 2: Molecular Representations

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6 Terms

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dashed wedge

pointing back into the paper

2
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solid wedge

pointing out of paper (towards me)

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resonance structures

2 different structures of the same compound

  • curved arrows show direction of movement (start from current location and point towards end location)

  • use formal charges

4
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vinyl

atoms in (pi) bond

5
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allyl

atoms next to the (pi) bond

  • look for allylic lone pairs for resonance delocalization

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5 main patterns of resonance structures

  1. allylic lone pair

  2. allylic carbocation (+)

  3. lone pair to adjacent C+

  4. pi bond w/atoms of dif. electronegativity (ex: C and O)

  5. pi bonds in enclosed ring