By Matthias Findeisen,Stefan Berger
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Additional info for 50 and More Essential NMR Experiments. A Detailed Guide
We think a suitable acronym for this type of experiment is CAMELSPIN (cross-relaxation appropriate for minimolecules emulated by locked spins). Ice-skating enthusiasts will have no dif¿culty with the origin of the term. Aksel A. Bothner-By, *1921, J. Am. Chem. Soc. 1984, 106, 811–813. 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.
Chem. 1998, 36, S44–S46.  R. Burger, C. Schorn, P. Bigler, "HMSC: Simultaneously detected heteronuclear shift correlation through multiple and single bonds" J. Magn. Reson. 2001, 148, 88–94.  N. T. Nyberg, J. O. Duus, O. W. Soerensen, "Editing of H2BC NMR spectra" Magn. Reson. Chem. 2005, 43, 971–974.  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. Reson. Chem. 2009, 47, 1086–1094.
2. Variants Originally, this method started as HMQC-TOCSY and rapidly gained interest especially in the ¿eld of natural products. Up to now, the most applications can be read in "Carbohydrate Research" or in the "Journal of Natural Products". Due to the sharpening of the signals in the F1 dimension, the HMQC part was replaced by HSQC. Combinations with DOSY are also known which separate the signals of mixtures. Common values: p1, p4, p6: 90° 1H transmitter pulse p2, p5, p8, p12: 180° 1H transmitter pulse p14, p16, p17, p19: 90° 13C transmitter pulse p13, p15, p18, p20: 180° 13C transmitter pulse p3, p7: trim pulse at high power p9, p11: trim pulse at low power p10: 90° and 180° pulses according MLEV-17 sequence at low power d1: relaxation delay t1: evolution increment d1, d2: 1/[2J(C,H)] 3.