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From bottom to top: 1H NMR spectra of 3, 3 after thermolysis at 60 °C for 80 h, NBD-NH2, and [Pt(dpk)Cl2] in DMF-d7. Resonances marked with circles are assigned to [Pt(dpk)Cl2] and resonances marked with crosses are assigned to NBD-NH2. The doublets at 8.8 and 7.3 ppm, and the broad singlet at 7.8 ppm are currently unassigned. The sharp singlet at 8 ppm in all spectra marked by an asterisk is from the solvent.
