Here we report the detailed measurement of long-range heteronuclear spin-spin coupling constants, especially (2,3)J(CH) spin-spin couplings for eight different cyclopentane derivatives. These (2,3)J(CH) constants were shown to be a useful tool in the determination of the relative stereochemistry in these rings. The coupling constant measurements reported here are based on two different experiments: a 2D heteronuclear correlation experiment named G-BIRDR,X-CPMG-HSQMBC and the 2D-coupled gHSQC {H-1-C-1} experiment Copyright (C) 2006 John Wiley & Sons, Ltd.4518286