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Gradient‐enhanced 1D HMQC‐ and HSQC‐relayed experiments with maximum sensitivity

The incorporation of pulsed‐field gradients for coherence selection into 1D proton‐detected pulse sequences provides clean spectra free of cancellation artifacts but, frequently, at the expense of a sensitivity loss by a theoretical factor of 2 due to the rejection of another contributed pathway. A series of slightly modified gradient‐enhanced 1D carbon‐selective HMQC‐ and HSQC‐relayed experiments are proposed to obtain maximum signal‐to‐noise ratios in the same overall acquisition time. In contrast to the implementation of this so‐called PEP approach in multi‐dimensional experiments, the proposed 1D experiments do not have extra requirements for data acquisition or data processing with respect to the original ones and the excellent spectral quality due to of gradient‐selected experiments is preserved. Copyright © 2001 John Wiley & Sons, Ltd.