By Matthias Findeisen,Stefan Berger

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E. Explain in detail how the gradient supported dual-stage lowpass ¿lter functions. F. Calculate the gradient strength for g4 and g5 in the case of 1 H, 15N HMBC. G. Why is an adiabatic chirp pulse used for p6? 9. Own Observations Chapter 2 Advanced Organic NMR Spectroscopy In rare cases the six NMR spectral methods which are given in Chapter 1 are not suf¿cient to elucidate the structure of a given compound. Of course there are a lot more techniques which can be employed. 9 Gated Decoupling 37 41 45 49 53 57 61 65 71 We describe therefore in this second chapter these nine methods in some details using appropriate molecules which demonstrate best the additional virtues of these techniques as an example.

7] J. Furrer "One-dimensional ROESY experiments with full sensitivity and reliable cross-peak integration when applied to natural products" J. Nat. Prod. 2009, 72, 1437–1441. 8. Questions A. Find a "handwaving" argument for the explanation of the spin lock used. B. Why should the power of the spin lock pulses be lower than they are in TOCSY? C. Explain the TOCSY breakthrough for the pair H-8, H-13. D. People often wonder about the relative assignment of H-1 and H-4. Discuss how the two ROESY crosspeaks of H-1 solve the problem.

1997, 125, 145– 148. [6] M. J. Thrippleton, J. Keeler "Elimination of zero quantum interference in two-dimensional NMR spectra" Angew. Chem. Int. Ed. 2003, 42, 3938–3941. [7] D. P. , Wiley-VCH, Weinheim, 2000. 8. Questions A. Explain why the mixing time is best approached by the spin-lattice relaxation time of the spins involved. B. What is meant by a NOESY build-up curve and how is it obtained? C. What is the reason that build-up curves have a maximum and decay to zero at long mixing times? D.

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50 and More Essential NMR Experiments. A Detailed Guide by Matthias Findeisen,Stefan Berger

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