Fast and simultaneous determination of H- H and H- F scalar couplings in complex spin systems: Application of PSYCHE homonuclear broadband decoupling.

The present manuscript focuses on fast and simultaneous determination of H- H and H- F scalar couplings in fluorinated complex steroid molecules. Incorporation of broadband PSYCHE homonuclear decoupling in the indirect dimension of zero-quantum filtered diagonal experiments (F1-PSYCHE-DIAG) suppresses H- H scalar couplings; however, it retains H- F scalar couplings (along F1 dimension) for the F coupled protons while preserving the pure-shift nature for H resonances uncoupled to F. In such cases, along the direct dimensions, H- H scalar coupling multiplets deconvolute and they appear as duplicated multiplets for the F coupled protons, which facilitates unambiguous discrimination of F coupled H chemical sites from the others. Further, as an added advantage, data acquisition has been accelerated by invoking the known ideas of spectral aliasing in the F1-PSYCHE-DIAG scheme and experiments demand only ~10 min of spectrometer times.