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The measurement of small homonuclear coupling constants is often prevented by either their small size and/or overlap with other signal splittings. Here, we present a real‐time method to extract such couplings without interference from other splittings, with a resolution that is beyond conventional NMR spectra. In this real‐time J‐upscaled SERF experiment, homonuclear coupling is removed by slice‐selective...
Although scalar-coupling provides important structural information, the resulting signal splittings significantly reduce the resolution of NMR spectra. Limited resolution is a particular problem in proton NMR experiments, resulting in part from the limited proton chemical shift range (∼10ppm) but even more from the splittings due to scalar coupling to nearby protons. “Pure shift” NMR spectroscopy...
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