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Coupling Constant, NMR - Coggle Diagram

- - - - tree diagrams
      - 和磁強度無關
      - 符號(g-/v+)、大小
    - - chemical equivalence
      - magnetic equivalence
        
        different coupling constant
  - - - 增長鍵長
      - 減小鍵角
      - 加入electronegative group
- - - - ← α, β, non-anomeric→
    - - pyran
        
        ← β, α, non-anomeric→
      - furan
        
        ← trans, cis, non-anomeric→
  - - - upfield shift
        
        acylation
        
        些微變化甚至不會有變化
      - downfield shift
        
        烷基化或醣基化
    - - upfield shift
        
        烷基化、silylation、醣基化
      - downfield shift
        
        acylation
        
        可能比anomeric更downfield
        
        因為1) acyl group 是EWG;
        2) H原子在C=O的shielding cone裡