Science & Fun | Home |  Introduction into the 1H NMR Spectroscopy

86

Answers:

  1. The signal at 3.56 ppm has a multiplicity M of 7 (6 equivalent neighboring protons)

    Did you come up with a different answer? Check page 73
    2. again for an explanation of the cause of multiplet formation.
  2. JCH,CH3 = JCH3,CH = 6.1 Hz,
    since the coupling between the methyl protons and the methine proton is mediated by the same bond electrons as the reverse coupling between the methine proton and the methyl protons.

    Complementary coupling constants (i.e., JAX and JXA) are always identical!

  3. Signal Dn [Hz] Dd [ppm] Irel
    0 0 0 20
    1/1' 6.1 0.1 15
    2/2' 12.2 0.2 6
    3/3' 18.3 0.3 1
    methine proton

If your result is different, you should go back one step to page 83.

Otherwise continue to page 84!