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Assessing 13C isotopic fractionation by suppressing NMR signals from fluorine atoms bound to 12C. (a) Standard 19F{1H} spectrum showing the parent 12C–19F peak flanked by two 13C–19F satellites. (b) The standard spectrum in (a), enlarged 125×. Accurate satellite integrals cannot be obtained directly due to overlap with the parent peak. (c) MQF 19F{1H} spectrum. Suppression of the parent peak allows accurate integration of the satellites.
