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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