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    in the compound propanol, the picture has the nmr spectra and the couplings, for the second carbon which has a peak at 1.5ppm, why does it split in to 5 peaks and why isnt there any other couplings - such as it would interact with the 3 protons on the ch3 to form a triplet and the 2 protons on the ch2 which could split the triplet peaks in to doblets to get a triplet of doublets?
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    (Original post by ScreamYourHeartOut)
    in the compound propanol, the picture has the nmr spectra and the couplings, for the second carbon which has a peak at 1.5ppm, why does it split in to 5 peaks and why isnt there any other couplings - such as it would interact with the 3 protons on the ch3 to form a triplet and the 2 protons on the ch2 which could split the triplet peaks in to doblets to get a triplet of doublets?
    Splitting only happens from the hydrogens on adjacent carbon atoms.

    You have the singlet on the far left as OH protons do not get split.

    Then next to the singlet you have a triplet caused by the adjacent -CH2- protons.

    Then you have a multiplet caused by the CH2 protons in the middle being split by the protons on both sides

    And finally the triplet caused by the splitting of the adjacent -CH2-protons of the middle.
 
 
 
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