Proton NMR Chemical Shifts for
Common Functional Groups
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- Electronegative groups are "deshielding" and tend to move NMR signals from neighboring protons further "downfield" (to higher ppm values).
- Protons on oxygen or nitrogen have highly variable chemical shifts which are sensitive to concentration, solvent, temperature, etc.
- The
-system of alkenes, aromatic compounds and carbonyls strongly deshield attached protons and move them "downfield" to higher ppm values.
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Copyright 1995, Paul R. Young, University of Illinois at Chicago, All Rights Reserved
