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• W1992783305 abstract "Homogeneous hydrogenations of unsaturated substrates with parahydrogen yield strong NMR signal enhancements of the transferred 1H nuclei if the symmetry of H2 is broken in the resulting hydrogenated products. This chemically induced hyperpolarization known as Parahydrogen-induced polarization (PHIP) is also transferred to other protons and heteronuclei (2H, 13C, 29Si, 31P) when the hydrogenation is initiated at low magnetic fields. Hydrogenating various fluorinated styrenes and phenylacetylenes, we show that PHIP-derived hyperpolarization is transferred to 19F not only in the Earth's magnetic field (ALTADENA condition) but also in a strong magnetic field, e.g., when carrying out the reaction in the NMR spectrometer (PASADENA condition). Upon conducting a systematic analysis of the observed PHIP transfer to 1H, 13C, and 19F in the hydrogenation products to elucidate the mechanisms that govern this parahydrogen-aided resonance transfer (PART), we conclude that high- and low-field PHIP transfer mechanisms differ in detail depending on either through-bond or through-space interactions. Substrates with high hydrogenation rates and long spin−lattice relaxation times (T1) yield the highest degree of heteronuclear hyperpolarization. Possible medical applications for hyperpolarized 19F-containing molecules as “active” contrast agents for magnetic resonance imaging (MRI) are outlined." @default.
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• W1992783305 date "2006-02-09" @default.
• W1992783305 modified "2023-10-10" @default.
• W1992783305 title "Transfer of Parahydrogen-Induced Hyperpolarization to ¹⁹F" @default.
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• W1992783305 doi "https://doi.org/10.1021/jp056219n" @default.
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