Heteronuclear correlation experiments for the determination of one-bond coupling constants

Spin-state selective experiments, HSQC-alpha/beta and CT-HMQC-alpha/beta, are proposed for the simple and rapid measurement of scalar one-bond coupling constants in two-dimensional, H-1-detected N-15-H-1 or C-13-H-1 correlation experiments based on HSQC and HMQC schemes. Pairs of subspectra are obtained, containing either the high-field or the low-field component of the doublet representing the one-bond coupling constant. The subspectral editing procedure retains the full sensitivity of HSQC and HMQC spectra recorded without heteronuclear decoupling during data acquisition, with a spectral resolution similar to that of decoupled spectra.