05 - NMR 4 - Other examples spin systems: 5 6 AMX to ABX 7...

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1 Tree diagrams on more complicated systems
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2 With diastereotopic groups:
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3 From here to infinity: living with strong coupling
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4 Where are those J’s in these spectra? With strong coupling, measurement may be impossible • When the chemical shift difference (in Hz) between two coupled nuclei becomes too small, we can see unusual looking patterns. Specifically, when ∆ν / J ~ 6 (or 10 in some texts), you will observe second order effects.
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Unformatted text preview: Other examples spin systems: 5 6 AMX to ABX 7 Expanded regions Look at the first plot below; compare to styrene 8 styrene What is a person to do? 9 Go to higher field (why?) If all else fails, simulate to get Js and shifts Many programs available, but it is usually an iterative process. That is, you make your simulated spectrum look like your experimental spectrum....
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This note was uploaded on 10/08/2009 for the course CHEM 439 taught by Professor Falzone,c during the Spring '08 term at Pennsylvania State University, University Park.

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05 - NMR 4 - Other examples spin systems: 5 6 AMX to ABX 7...

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