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The measured reactivity indices (β-values) of heterocoerdianthrones (HCDs) in self-sensitized photoperoxidation indicate a high reactivity toward singlet-oxygen. Such a high reactivity is not only due to an effective singlet-oxygen production due to the highly fluorescent character, but also due to a strained structure, as predicted by a molecular calculation. On the other hand, the large thermal stability of their endoperoxides (POs), revealed by the large activation energy in thermal decomposition, is also explained by considering the strained structure of the parent HCDs. As a prospect of solar synthesis, one of the HCD derivatives was applied to a photosensitizer for singlet-oxygen oxidation.

A response study of the hydrodenitrogenation of acridine and carbazole on a reduced MoO3/Al2O3 catalyst was performed at 300 °C and 10.1 MPa total pressure. Acridine was strongly adsorbed on the acidic sites of the catalyst surface for hydrogenation, while carbazole was weakly adsorbed not only on the same sites as acridine, but also on the terminal oxygen anion sites in the presence of strong bases.