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Extra info for 50 and More Essential NMR Experiments. A Detailed Guide
Note that the diagonal signals have a negative phase (black contours). , the crosspeak between H-4 and H-3 and the cross peak between H-8 and H-13 where apparently the strong coupling results in a TOCSY pattern. There is a wealth of information to be taken from the spectrum, which can best be studied with a molecular model. Note, for instance, that only one of the H-20 protons is connected with one of the H-15 protons, from which a relative assignment of the diastereotopic protons in these methylene groups can be derived.
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