By Matthias Findeisen,Stefan Berger

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2-1 4. Acquisition Special values used for the spectrum shown: Sample: 3% strychnine in CDCl3. Time requirement: 5 h Spectrometer: Bruker DRX-600 with 5-mm-TBI-probe Common values: p1: 90° 1H transmitter pulse p2,p3: 180° 1H transmitter pulse at spin lock power n: integer loop counter determines the spin lock length n = length / (p2+p3) d1: relaxation delay t1: evolution increment 41 Advanced Organic NMR Fig. 2-1: A. A. 5 dB 8 832 (corresponds to spin lock of 300 ms) 16 5. Processing 19 18 td2: td1: sw2: sw1: aq2: aq1: o1: d1: p1: p2, p3: ds: n: ns: 20 15 14 21 H 22 11 HO 24 23 Apply zero-¿lling in F1 to 1K real data points to obtain a symmetrical matrix of 1K × 1K real data points.

8] R. Wagner, S. Berger, "ACCORD-HMBC: A superior technique for structural elucidation" Magn. Reson. Chem. 1998, 36, S44–S46. [9] R. Burger, C. Schorn, P. Bigler, "HMSC: Simultaneously detected heteronuclear shift correlation through multiple and single bonds" J. Magn. Reson. 2001, 148, 88–94. [10] N. T. Nyberg, J. O. Duus, O. W. Soerensen, "Editing of H2BC NMR spectra" Magn. Reson. Chem. 2005, 43, 971–974. [11] T. E. Burrow, P. G. Enriquez, W. F. Reynolds "The signal/noise of an HMBC spectrum can depend dramatically upon the choice of acquisition and processing parameters" Magn.

1984, 58, 370– 388. [4] R. Wagner, S. Berger "Gradientselected NOESY—A fourfold reduction of the measurement time for the NOESY experiment" J. Magn. Reson. Ser. A 1996, 123, 119–121. 21 The Organic Set [5] T. Parella, F. Sánchez-Ferrando, A. Virgili "Quick recording of pure absorption 2D TOCSY, ROESY, and NOESY spectra using pulsed ¿eld gradients" J. Magn. Reson. 1997, 125, 145– 148. [6] M. J. Thrippleton, J. Keeler "Elimination of zero quantum interference in two-dimensional NMR spectra" Angew.

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