13.6 Interpreting Proton NMR Spectra - Columbia University
13.6 Interpreting Proton NMR
Spectra
Information contained in an NMR spectrum includes:
1. number of signals 2. their intensity (as measured by area
under peak) 3. splitting pattern (multiplicity)
Number of Signals
protons that have different chemical shifts are chemically nonequivalent exist in different molecular environment
Figure 13.9 (page 497) N CCH2OCH3 OCH3
NCCH2O
10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0
Chemical shift (, ppm)
Chemically equivalent protons
are in identical environments have same chemical shift replacement test: replacement by some arbitrary "test group" generates same compound
H3CCH2CH3
chemically equivalent
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