Simultaneous determination of the magnitude and the sign of multiple heteronuclear coupling constants in ¹⁹F or ³¹P-containing compounds

Copyright © 2015 John Wiley & Sons, Ltd. The presence of a high-abundant passive nucleus (Z=19F or 31P) allows the simultaneous determination of the magnitude and the sign of up to three different heteronuclear coupling constants from each individual cross-peak observed in a 2D 1H-X selHSQMBC spectrum. The incorporation of an extended TOCSY transfer and the use of time-shared versions allow the extraction of a complete set of all these heteronuclear coupling constants and their signs for an entire 1H subspin system and for several heteronuclei in a single NMR experiment. The presence of a highly abundant passive nucleus (Z=19F or 31P) allows the simultaneous determination of the magnitude and the sign of up to three different heteronuclear coupling constants from each individual cross-peak observed in a 2D 1H-X selHSQMBC spectrum. Whereas J(HZ) and J(XZ) coupling constants are measured from E.COSY multiplet patterns, J(XH) is independently extracted from the complementary IPAP pattern generated along the detected F2 dimension. The incorporation of an extended TOCSY transfer allows the extraction of a complete set of all these heteronuclear coupling constants and their signs for an entire 1H subspin system. 1H-X/1H-Y time-shared versions are also proposed for the simultaneous measurement of five different couplings (J(XH), J(YH), J(XZ), J(YZ), and J(ZH)) for multiple signals in a single NMR experiment.