The cascade operation continues with a third cycle, as shown in Figure . It begins with the N-oxidation of the PI ligand in complex 17, most likely facilitated by hydroxyl radicals, forming complex 21. This new sequence introduces a unique formaldehyde condensation process involving the aldehyde group on the side chain of the organotitanium complexes. This leads to the consecutive formation of complexes 22, 23, and 24, marking another step in the cascade transformation. A breakdown of the second sub-cycle highlights the following key steps: