The highest TON values were observed for the cases of composites obtained by pyrolysis of copper complexes with Phen (Fig. ), while for the reactions, carried out in presence of DAB-based composites high TON values were not observed. In turn, high TON values (>50) were observed for the composites, prepared at different pyrolysis temperatures (Fig. (a)), as well as at different pyrolysis rates (Fig. (b)), thus there was no correlation between these parameters and catalytic activity. According to EDX data, samples Cu@SiO2-14 and Cu@SiO2-18, which showed good product yield, had a high carbon content at the 41% and 47% levels. It could be supposed that carbon, along with copper, contributed to the catalytic performance of the composites in this reaction. In order to check this supposition, the yields of 3 were plotted vs. parameters XCu and XC, which characterized the amounts of copper and carbon, respectively, located on the outer surface of the composites and accessible to the reagent molecules. These parameters XCu and XC were calculated as the contents of copper and carbon, respectively, in the composites according to the EDX, multiplied by the mass of the composite in the reaction mixture, taking in mind that the surface of the composites should be similar (the latter supposition is reasonable, because all composites were prepared by decomposition of the complexes on the same support).