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I'm currently a college student taking Organic Chem and I've no idea how to figure out the J-coupling for H-NMR and neither my professor/TA's/book are being helpful. Does one apply the n+1 rule first to figure the number of peaks and then apply the various couplings to each peak?

I understand that if a single H has two non-equivalent neighboring protons, you'd get a doublet of doublets instead of a triplet. But say, for example, how would I figure out the signal for the hydrogens attached to the terminal C of the double bond in 1-pentene ( the first carbon in, CH2=CHCH2CH2CH3)?

Thank you very much for your time.

asked Aug 06 '10 at 12:44

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Scott
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updated Aug 07 '10 at 11:37

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Evgeny Fadeev
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Hi Scott This was answered in question 14 of this wiki and I cut and paste two papers recommended by Evgeny: A Practical Guide to First-Order Multiplet Analysis in 1H NMR Spectroscopy by Hoye, Hanson and Vyvyan A Method for Easily Determining Coupling Constant Values: An Addendum to “A Practical Guide to First-Order Multiplet Analysis in 1H NMR Spectroscopy” by Hoye and Zhao (2002)

If you start there you should be able to work through first order spectra.

Tim

link

answered Aug 07 '10 at 08:12

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timburrow
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updated Aug 07 '10 at 11:35

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Evgeny Fadeev
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