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. Author manuscript; available in PMC: 2017 May 10.
Published in final edited form as: Angew Chem Int Ed Engl. 2016 Apr 8;55(20):6071–6074. doi: 10.1002/anie.201600521

Figure 1.

Figure 1

a) Molecular addition of para-H2 to vinyl acetate1-13C (VA-1-13C) followed by polarization transfer resulting in 13C hyperpolarized ethyl acetate-1-13C (13C HP EA-1-13C); b) Conversion profile for vinyl acetate (VA, 80 mM, in methanol-d4, at ~40 °C temperature maintained by the 9.4 T NMR spectrometer) hydrogenation reaction in four pressure regimes; c) Dependence of “HA” signal of hyperpolarized ethyl acetate (1H HP EA) on the para-H2 bubbling duration at the Earth’s magnetic field (resulting in ALTADENA[24]-type spectrum shown in inset); d) (Top) schematic representation of experimental setup for magnetic field cycling: hydrogenation is carried out at the Earth’s magnetic field, the sample then is quickly moved inside -metal shield (with magnetic field BFC) and slowly transferred from the shield for subsequent NMR detection; (bottom) schematic magnetic field profile during the field cycling; e) Dependence of HP 1-13C NMR signal (shown in the insert) of ethyl acetate (13C HP EA) on the BFC; f) Thermal spectrum of 13C signal reference sodium acetate-1-13C (~2.0 M).; g) 13C HP spectrum of natural abundance 80 mM ethyl acetate (13C HP EA). Note the resonances labeled with ° correspond to HP 13C resonances originating from hydrogenation catalyst (Figure S7); h) HP 13C spectrum of 80 mM ethyl acetate-1-13C (13C HP EA-1-13C).