H NMR (Proton NMR)

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Author:
rayreg22
ID:
285440
Filename:
H NMR (Proton NMR)
Updated:
2014-10-10 12:52:49
Tags:
NMR Proton Nuclear Magnetic Resonance
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Description:
H NMR (Proton NMR) Nuclear Magnetic Resonance
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  1. H NMR:
    What do you find in the 0.9 - 2.0 ppm region?
    • H's belonging to an alkane Carbon
    • (the Carbon the H is attached to is just single bonded to either 1, 2, or 3 other R groups)

    The more OTHER things the Carbon is bound to (i.e. the less 'brother' H's it has, the closer to 2.0 it becomes)
  2. H NMR:
    What do you find in the 1.5 - 2.5 ppm region?
    • H's belonging to a Carbon that is NEXT to another Carbon that is double-bonded
    • (i.e. H's next to either an Alkene OR a Carbonyl)

    • What you're picking up is the H neighbors on the other side of the Alkene or Carbonyl carbon, i.e. the H's that are actually TWO carbons away (ex: a Ketone.. the H's from the left side to the right side)
    • >> You CANNOT actually move up across the Alkene here; only can continue to follow the 'alkane chain' that happens to have Alkene or Carbonyl branching off of it
  3. H NMR:
    What do you find in the 2.5 - 4.0 ppm region?
    H's attached to a Halogenated Carbon!
  4. H NMR:
    What do you find in the 4.5 - 6.0 ppm region?
    • H's attached to an Alkene carbon!
    • (not to an Aromatic though.. Aromatic = the next region higher due to higher # of double bonds)
  5. H NMR:
    What do you find in the 6.5 - 8.0 ppm region?
    • H's attached to an Aromatic Ring
    • (i.e. a phenyl)
  6. H NMR:
    What do you find in the 9.0 - 10.0 ppm region?
    • H NMR, 9.0 - 10.0:
    • H's belonging to an Aldehyde
  7. H NMR:
    What do you find in the 10.0 - 12.0 ppm region?
    H's belonging to a Carboxylic Acid

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