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Stereoisomerism, Recall: Isomers, Conformation? - Coggle Diagram

- - - - A carbon atom bonded to 4 unique groups of atoms
    - - Interchangeable Bond
        
        Achiral
    - - Atropisomers
        
        The sigma bond is unable to rotate.
        = The conformations are stuck and not interchangeable.
        
        Axis of chirality
      - Allenes
        
        R / S Configuration
  - - - Physical properties
    - - 1) How they interact with other chiral compounds
      - 2) their optical activity
  - - - Counterclockwise
    - - Clockwise
        
        Racemate / Racemic Mixtures 外消旋體 / 外消旋混合物
- - - - Molecules with an even # of chirality center that have a plane of symmetry
- - - - For enantiomers
        (same physical properties)
  - - - For different physical properties
- - - - S Configuration
      - R Configuration
        
        Racemate / Racemic Mixtures 外消旋體 / 外消旋混合物
    - - Atropisomers