J (Hz)

Method: DAD HLA-group electronegativity HLA-chemical groups Karplus
Choose a substituent and then click the corresponding Group box below:

	S1	S2	S3	S4
Group
constant

Enter a value for phi or ³J and then click on the background:
phi: ^o  => ³J: Hz

³J: Hz  =>  phi:      ^o

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Methods:
  • DAD: Diez, Altona, Donders: with chemical groups
  • HLA: Haasnoot, deLeeuw, Altona: with group electronegativity including the beta effect
  • HLA: Haasnoot, deLeeuw, Altona: with chemical groups
  • Karplus: Karplus equation: no substituent corrections

      Equations and References

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Colby College Chemistry, T. W. Shattuck, 1/10/2009