A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Safety of 6,6′-Dibromo-2,2′-bipyridine, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 49669-22-9, Name is 6,6′-Dibromo-2,2′-bipyridine, molecular formula is C10H6Br2N2. In a Article, authors is Haberhauer, Gebhard，once mentioned of 49669-22-9
Control of planar chirality: The construction of a copper-ion-controlled chiral molecular hinge
(Figure Presented) An open-and-closed case: When a chiral clamp is attached to a molecular hinge the open-close motion induced by coordination to a metal ion becomes unidirectional (see scheme). The large change in amplitude caused by the unidirectional rotation and the relatively simple preparation of the hinge open up the possibility of using this concept for even more-complex molecular machines.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI