A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, name: N-Carbethoxy-4-piperidone, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 29976-53-2, Name is N-Carbethoxy-4-piperidone, molecular formula is C8H13NO3. In a Article, authors is Werth, Jacob，once mentioned of 29976-53-2
Cobalt pyridine?diimine (PDI) complexes catalyze the reductive spirocyclopropanation of terminal 1,3-dienes. gem-Dichlorocycloalkanes serve as carbene precursors and Zn is used as a terminal electron source. The reaction is effective for a range of gem-dichloro partners including those containing sulfur and nitrogen heterocycles. An example of an intramolecular Rh-catalyzed [5+2]-cycloaddition of a vinyl spirocyclopropane is demonstrated, providing rapid access to a complex tricyclic framework. Overall, this catalyst system is capable of suppressing the kinetically facile 1,2-hydride shift, which has hampered the development of Simmons?Smith reactions using Zn carbenoids possessing beta-hydrogen atoms. (Figure presented.).
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Reference：
Piperidine – Wikipedia,
Piperidine | C5H10117N – PubChem