Bloch-Siegert shifted correlations in solution NMR spectroscopy

We further develop the concept of refocusing scalar couplings in solution NMR spectroscopy by means of 2-field correlations as recently presented in doi:10.26434/chemrxiv-2024-r9tgw. We show that Bloch-Siegert shifts can be used as fictitious secondary fields for such purpose. This allows correlations to be made with data acquired in a single external magnetic field. A homonuclear 2D correlation spectroscopy experiment can be easily modified so as to include these rf-driven shifts in the indirect dimension. Furthermore, the inclusion of such effects in window-acquired 1D spectra allows for synthetic homonuclear decoupling procedures to be performed.