Abstract
A zirconocene double act: The course of zirconocene-mediated macrocyclization is controlled by templating effects. In macrocyclizations of bipyridine-containing diynes, the zirconocene reagent [Cp2 Zr(py)(Me3 SiC≡SiMe3 )] (1; py=pyridine) acts as both coupling and templating agent. Thus, by controlling the stoichiometry, dimeric or trimeric macrocycles are obtained.
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