Sila[1]ferrocenophanes with Bulky Substituents

In this study, sila[1]ferrocenophanes with sterically bulky groups such as tris(trimethylsilyl) or N‐heterocyclic iminato located at the bridging silicon atom are synthesized. The reactions of silicon‐bound chloride in Fe(η 5 ‐C 5 H 4 ) 2 SiCl 2 ( 1 ) with K[Si(SiMe 3 ) 3 ] and silylated N‐heterocyclic imine result in sila[1]ferrocenophanes 2 and 3 with bulky silicon‐ and nitrogen‐based substituents at the ansa‐bridge via elimination of KCl and Me 3 SiCl. Subsequently, the reduction of 1 is attempted using 2,3,5,6‐tetramethyl‐1,4‐bis(trimethylsilyl)‐1,4‐dihydropyrazine (popularly known as Mashima reagent), which leads to the elimination of Me 3 SiCl and generation of 1,4‐dihydropyrazine‐spanned sila[1]ferrocenophanes ( 4 ). All the compounds are structurally characterized.