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Inverse Heteronuclear 2D Experiments HSQC, HMQC, and HMBC

INVERSE HETERONUCLEAR 2D EXPERIMENTS HSQC, HMQC, AND HMBC [Pg.489]

NMR Spectroscopy Explained Simplified Theory, Applications and Examples for Organic Chemistry and Structural Biology, by Neil E Jacobsen Copyright 2007 John Wiley Sons, Inc. [Pg.489]

Another advantage of ll observation is that a proton can only be attached to one 13C. We saw in Chapter 7 the complexities of refocusing of 13 C antiphase coherence different times are optimal for CH, CH2, and CH3 groups. A proton coupled to 13C will always be a doublet—never a triplet or quartet—and will evolve into antiphase or refocus from antiphase to in-phase in a time of exactly 1/(2J). [Pg.490]

We saw in Chapter 2 (Fig. 2.18) that the intensities of these two peaks (singlet for H-12C and doublet for H- C) are reversed for 13C-labeled compounds The wide doublet dominates, and the residual 12C shows up as a tiny central singlet. Not only are the protons directly attached to 13 C split into doublets, but also those two or three bonds away (13C-CH and [Pg.490]




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2D HSQC

And inversion

HMBC

HMQC

HMQC/HSQC

HMQC/HSQC experiment

HSQC

Heteronuclear experiment

Inverse experiment

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