Organic Chemistry

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5. Chirality

Atropisomers

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These are exceptions to the rule:molecules that contain no chiral centers yet are chiral due to their inability to freely rotate.

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Recognizing chiral molecules with zero chiral centers.

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Allenes

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Determining if allenes are chiral or not.

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Imagine that the allene is a big double bond. If it is able to form E or Z isomers, it is chiral

Is the following allene chiral?

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Is the following allene chiral?

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Is the following allene chiral?

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Is the following allene chiral?

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Substituted Biphenyls

Is the following substituted biphenyl chiral?

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Determining if substituted biphenyls are chiral or not.

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Must meet two criteria to be chiral:

  1. All substituents are in the ortho- position
  2. None of the rings have two of the same group on them

*ortho- is a term we'll use in Organic Chem 2. It basically means that a group is adjacent to the primary carbon linking the two rings. 

Is the following substituted biphenyl chiral?

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Is the following substituted biphenyl chiral?

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Is the following substituted biphenyl chiral?

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Is the following substituted biphenyl chiral?

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