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NMR N uclear M agnetic R esonance. Proton NMR (and other nuclei): Conformational exchange. Index. NMR-basics. H-NMR. NMR-Symmetry. Heteronuclear-NMR. Dynamic-NMR. Chemical Equivalence by Interconversion. Equivalence in Shift Depends on Temperature, Solvent, Catalyst….

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nmr n uclear m agnetic r esonance

NMRNuclear Magnetic Resonance

ProtonNMR (and other nuclei):

Conformational exchange

Index

NMR-basics

H-NMR

NMR-Symmetry

Heteronuclear-NMR

Dynamic-NMR

chemical equivalence by interconversion
Chemical Equivalence by Interconversion

Equivalence in Shift Depends on Temperature, Solvent, Catalyst…

  • Keto-Enol Interconversion
  • Restricted Rotation (amides)
  • Rings InterconversionAxial H -> equatorial H

Rapid at room temperature, Slow at –60C

keto enol interconversion4
Keto-Enol Interconversion

CH3

CH2

=CH

=CH

Keto

CH2

OH

enol

keto enol interconversion5
Keto-Enol Interconversion

=CH

CH3

Keto

CH2

enol

Keto

ring interconversion9
Ring Interconversion

C-NMR

30oC

Cis-1,4-dimethylcyclohexane

-60oC

exchange dnmr dynamic nmr
Exchange : DNMR – Dynamic NMR

NMR is a convenient way to study rate of reactions – provided that the lifetime of participating species are comparable to NMR time scale (10-5 s)

At low temperature, hydrogens form an A2B2X spin system

At higher temperature germanium hop from one C to the next

slide12

Index

NMR-basics

H-NMR

NMR-Symmetry

Heteronuclear-NMR

Dynamic-NMR

NMR and Organometallic compounds