Synthesis of spiroindenopyridazine-4 H -pyran derivatives using Cr-based catalyst complexes supported on KCC-1 in aqueous solution.

An efficient bis(2-dodecylsulfanyl-ethyl)-amine·CrCl 3 complex supported on KCC-1 (KCC-1/SNS/Cr) has been developed for the synthesis of spiroindenopyridazine-4 H -pyran, providing excellent yields of the corresponding products with remarkable chemoselectivity. This morphology ultimately leads to higher catalytic activity for the KCC-1-supported nanoparticles. The KCC-1/SNS/Cr NPs were thoroughly characterized by using TEM, SEM, TGA, FT-IR, ICP-MS, and BET. The recycled catalyst has been analyzed by ICP-MS showing only minor changes in morphology after the reaction, thus confirming the robustness of the catalyst.