The development of a new macrocyclization reagent, Rosenthal's Cp2Zr (pyr)(Me3SiC⋮ CSiMe3), has allowed the preparation of two large, functionalized macrocycles. The diyne 5, 5'-bis (4-trimethylsilylphenyl)-2, 2'-bipyridine was trimerized to the bipyridine-containing macrocycle 5, and 1, 4-bis (4-(trimethylsilyl) ethynyl-phenyl)-2, 3-diphenyl-1, 4-diazabuta-1, 3-diene was dimerized to macrocycle 6. Both zirconocene-containing macrocycles were ...
![Silane, trimethyl[p- (trimethylstannyl)phenyl]- Structure](https://image.chemsrc.com/caspic/075/944-32-1.png)