Review of Spectroscopic Methods III

Review of Spectroscopic Methods III - Quick Review of...

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Quick Review of Spectroscopic Methods III. Overview of 1 H and 13 C NMR.
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Values for Coupling Constants
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Complex Splitting Signals may be split by adjacent protons, different from each other, with different coupling constants. Example: H a of styrene which is split by an adjacent H trans to it (J = 17 Hz) and an adjacent H cis to it (J = 11 Hz). C C H H H a b c
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Splitting Tree C C H H H a b c
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Spectrum for Styrene
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Stereochemical Nonequivalence Usually, two protons on the same C are equivalent and do not split each other. If the replacement of each of the protons of a -CH 2 group with an imaginary “Z” gives stereoisomers, then the protons are non-equivalent and will split each other.
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Some Nonequivalent Protons OH H H H a b c d CH 3 H Cl H H Cl a b C C H H H a b c
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Chemical shift will depend on concentration and solvent. To verify that a particular peak is due to O- H or N-H, shake the sample with D 2 O. Deuterium will exchange with the O-H or
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Review of Spectroscopic Methods III - Quick Review of...

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