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You will have two coupling constants, Ja and Jb.  Ja is the frequency difference between the CENTERS of the TWO DOUBLETS.  Jb is the frequency difference between the TWO PEAKS in a SINGLE DOUBLET.

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The coupling constant of a doublet of doublet can be calculated by measuring the distance between the two sets of doublet peaks in the NMR spectrum and dividing it by the difference between the chemical shifts of the two multiplets. This value represents the coupling constant J value in Hz.

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10mo ago
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Q: How do you calculate the coupling constant of doublet of doublet?
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