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. Author manuscript; available in PMC: 2015 Jan 8.
Published in final edited form as: J Phys Chem B. 2013 Jan 23;117(5):1219–1224. doi: 10.1021/jp3089462

Figure 4.

Figure 4

Polarization yield of hyper-SHIELDED sequence versus GPS.14 (a) Boltzmann polarized carbon-13 spectrum acquired from an aqueous solution containing 170 mmol of the reaction product. (b) Reaction schematic for synthesizing parahydrogenated 2-hydroxyethyl 1-13C-propionate-d3 (HEP). (c) Experimentally determined yields for hyper-SHIELDED and GPS comparison sequence were nearly identical and in accord with theory for the coupling arrangement in the test HEP molecule.