The stability constants (log K), reaction enthalpies (ΔH) and reaction entropies (TΔS) for the reaction of CB with different DABCO derivatives in aqueous formic acid (50 vol %) at 25 °C are summarized in Table . To our knowledge there are no known results from the literature available for comparison. Using 1 H-NMR measurements Nau and coworkers could not observe any complexation with DABCO .