By Matthias Findeisen,Stefan Berger
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Barbato, R. Bazzo, "Sensitivity enhancement of a two-dimensional experiment for the measurement of heteronuclear long-range coupling constants, by a new scheme of coherence selection by gradients" J. Magn. Reson. 2001, 148, 209–213.  A. Meissner, O. W. Sørensen, "Measurement of J(H,H) and long-range J(X,H) coupling constants in small molecules, broadband XLOC and JHMBC" Magn. Reson. Chem. 2001, 39, 49–52.  R. Wagner, S. Berger, "ACCORD-HMBC: A superior technique for structural elucidation" Magn.
6-3 8. Comments 20 23 HMBC has originally been derived from HMQC by simply increasing the delay after the ¿rst pulse before the creation of multiple-quantum coherence. 6-1 comprise this original experiment . The ¿rst 90° proton pulse creates a transverse proton magnetization − I H y as in Equation (1). During the delay d4 the 2J and 3J CH spin couplings develop and create antiphase magnetization 2 I H x I C z . I Hx πJ τI z ICz IH + I C ⎯⎯ ⎯→ − I H + I C ⎯⎯⎯H⎯ ⎯ ⎯→ 2 IH IC z z y z x z The two 13C pulses p3 and p4 and the three gradient pulses g1 to g3 during the preparation period p serve as a dual-stage low-pass ¿lter .
3] A. G. Palmer III, J. Cavanagh, P. E. Wright, M. Rance "Sensitivity improvement in protondetected two-dimensional heteronuclear correlation NMR spectroscopy" J. Magn. Reson. 1991, 93, 151–170.  G. Kontaxis, J. Stonehouse, E. D. Laue, J. Keeler "The sensitivity of experiments which use gradient pulses for coherence pathway selection" J. Magn. Reson. Ser. A 1994, 111,70–76.  J. Schleucher, M. Schwendinger, M. Sattler, P. Schmidt, O. Schedletzky, S. J. Glaser, O. W. Sørensen, C. Griesinger "A general enhancement scheme in heteronuclear multidimensional NMR employing pulsed-¿eld gradients" J.
50 and More Essential NMR Experiments. A Detailed Guide by Matthias Findeisen,Stefan Berger