NMR Spectroscopy
When placed in a magnetic field, all the random spins of the nuclei

rotate to 90° away from the induced field
stop
reverse direction
align with the magnetic field

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NMR Spectroscopy
All hydrogen atoms

resonate at about the same frequency as carbon
resonate at different frequencies depending on their environment.
are attached to carbon
have the same resonance frequency

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NMR Spectroscopy
Coupling causes the peaks in 1H NMR spectra to be split into

two peaks
multiple peaks equal to the number of surrounding carbon atoms
multiple peaks equal to the number of hydrogen on surrounding atoms, plus one
multiple peaks equal to the number of hydrogens on surrounding atoms

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NMR Spectroscopy
What is shielding in NMR?

Using a curved piece of metal to block an opponents attack
Blocking parts of a molecule from Rf radiation
Putting metal around an Rf source
When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei

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