Nuclear Magnetic Resonance (NMR) Spectroscopy

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Presentation transcript:

Nuclear Magnetic Resonance (NMR) Spectroscopy • Identify the environment of hydrogen and carbon atoms • Identify atom connectivity • Identify stereochemical relationships

An NMR Spectrometer

1H NMR of Acetone

1H NMR of Methyl Acetate

Electron Density Maps

Electron Shielding

1H NMR of Methyl Acetate

1H NMR of Ethyl Acetate 3 3 2

A Splitting Diagram for a Doublet of Doublets

The Difference between a Quartet and a Doublet of Doublets

Diamagnetic Anisotropy

Dry, ultra-pure ethanol Ethanol with trace acid

Common NMR Shifts

Common NMR Shifts

Putting It All Together

Putting It All Together

Putting It All Together

Four Similar Unknowns Molecular Ion = 74 [C4H10O]

Unknown #1 9 1

Unknown #2 6 2 1 1

Unknown #3 3 2 1 4

Unknown #4 1 7 2

Common 13C Chemical Shifts

Proton Decoupling

13C NMR of Ethyl Acetate

13C NMR of Ethyl Acetate

Can we identify this compound?

Can we identify this compound?

Can we identify this compound? 3 2 1 1 1

Can we identify this compound? 86 14 62 152