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Why is HMBC intrinsically less sensitive than HSQC? B. What is the expected range of 1J(C,H) in organic Chemistry? C. Why does one observe 1J breakthrough especially for C-4 and C-17? D. Why has the processing of this spectrum to use the magnitude mode, although the phase-sensitive echo-antiecho recording technique is employed? 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?

Phase correction is applied in both dimensions. 6. Result Fig. 4-2 Sugar Cane (Saccarum) 50 The ¿gure shows an expansion of the HSQC-TOCSY spectrum obtained on an DRX-600 spectrometer equipped with a TBI z-gradient HSQC-TOCSY probe head. The spectrum is very intriguing since we see six times a completely separated TOCSY spectrum of the glucose moiety of sucrose, edited by each carbon atom of this subunit. 9 ppm contains the diagonal signal of C-1'. Similarily we observe four times a 13C-edited TOCSY spectrum of the fructose subunit.

Reson. Chem. 1993, 31, 287–292. [3] J. Ruiz-Cabello, G. W. Vuister, C. T. W. Moonen, P. van Gelderen, J. S. Cohen, P. C. M. van Zijl "Gradient-enhanced heteronuclear correlation spectroscopy. Theory and experimental aspects" J. Magn. Reson. 1992, 100, 282–302. [4] R. Araya-Maturana, T. DelgadoCastro, W. Cardona, B. E. Weiss-Lopez "Use of long-range C-H heteronuclear multiple bond connectivity in the assignment of the 13C NMR spectra of complex organic molecules" Current Organic Chemistry, 2001, 5, 253–263.

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


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