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Hyperpolarization of 15N2-diazirine-tagged choline derivative 5. SABRE-SHEATH conditions: 5 (12.5 mm) and Ir precatalyst B (125 μm) in [D4]MeOH with either pyridine (1.00 mm) or D2O (925 mm). Signal enhancement measured at 8.45 T and calculated by comparison to a reference of neat 15N-acetonitrile. T1 measured at 1 T. See the Supporting Information for more measurements at other fields. Ts=p-toluenesulfonyl.
