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CHEM 262 - NMR

Chemical shift values for common proton chemical environments.

Chemical EnvironmentChemical Shift
alkyl group protons 0.9 ppm - 1.8 ppm (chemical shift increases w/ sterics)
geminal halide protons 2.8 ppm - 4.2 ppm (inductive effect falls off w/ distance; directly proportional to electronegativity)
carboxylic acid protons 11.0 ppm - 12.0 ppm (due to resonance effect and inductive effect)
benzene protons 7.2 ppm (delocalized electrons circulate and produce a constructive magnetic field)
benzyllic protons 2.0 ppm - 2.5 ppm (anisotropy effect falls off w/ distance)
olefin protons 5.0 ppm - 6.0 ppm (delocalized electrons circulate and produce a constructive magnetic field)
acetylene protons 2.0 ppm (delocalized electrons circulate and produce a deconstructive magnetic field)
hydroxyl protons special case (chemical shift depends on concentration b/c of H-bonding)



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