Ch_322a_9.011

Ch_322a_9.011 - Predicting Splitting Patterns by Geometric...

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Predicting Splitting Patterns by Geometric Analysis The number and relative intensities of the splittings in a resonance due to spin-spin coupling may be predicted from a simple geometric analysis. Consider a resonance for one or more magnetically equivalent H: If H is not spin-spin coupled to any nearby H , the resonance is a single line. singlet If H spin-spin couples to one H with J , the resonance is a doublet. J 1 : 1 doublet
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If H spin-spin couples to two H with J , the resonance is a triplet. J J J 1 1 : : 2 triplet
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If H spin-spin couples to three H with J , the resonance is a quartet. J J J J J J 1 1 3 3 : : : quartet
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Top: The 60-MHz 1 H NMR spectrum showing overlapping signals at ! 4. Bottom: The 300-MHz 1 H NMR spectrum showing resolution of the overlapping signals with expansions in the offsets. ClCH 2 C OCH 2 CH 3 O = (b) (c) (a) H (a) (split by 2 eq H) J H (c) (split by 3 eq H) J J J a triplet H (b) is a singlet. J
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_9.011 - Predicting Splitting Patterns by Geometric...

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