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Hyperpolarization of 15N2-diazirines 2–4. Standard conditions: diazirines 2–4 (12.5 mm) and Ir precatalyst A (125 μm) in [D4]MeOH. [a] Signal enhancement measured at 8.45 T and calculated by comparison to a reference of neat 15N-acetonitrile. [b] T1 measured at 1 T. Mes=2,4,6-trimethylphenyl; py=pyridyl; TBS=tert-butyldimethylsilyl.
