INEPT-and HMQC-based pulse sequences are widely used to transfer polarization between
heteronuclei, particularly in biomolecular spectroscopy: they are easy to setup and involve
low power deposition. Still, these short-pulse polarization transfers schemes are challenged
by fast solvent chemical exchange. An alternative to improve these heteronuclear transfers
is J-driven cross polarization (J-CP), which transfers polarization by spin-locking the coupled
spins under Hartmann-Hahn conditions. J-CP provides certain immunity against chemical …