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Please keep in mind:

The coupling constant J is - in contrast to the chemical shift of a resonance signal - not dependent on the external magnetic field of the spectrometer, but rather on the magnetic fields of the neighboring nucleii.
Example: For the methyl protons in (CH3)2CH-O-CH(CH3)2the following coupling constants have been determined at different fields:
  JCH3,CH   (at n0 = 250 MHz) = 6.1 Hz
      (at n0 = 600 MHz) = 6.1 Hz

Draw this doublet (d = 1.05 ppm) as it would appear in a spectrum with n0 = 100 MHz. Use the following d axis!


Compare your spectrum with the doublets on page 81!

Then continue to page 88!