Ring-Opening Polymerization of a Galla[1]ferrocenophane: A Gallium-Bridged Polyferrocene with Observable Tacticity

摘要

Since Manners et al. reported that thermal ring-opening polymerization (ROP) of dimethylsila[1]ferrocenophane (1) yields high-molecular-weight poly(ferrocenyldimethylsilane) (2), the tool box for ROP of strained sandwich compounds has been developed significantly. To date, in addition to thermal ROP, transition metal catalyzed-, anionic-. and photocontrolled ROP of metallacyclo-phanes are described in the literature. The latter two methods are of particular interest as they can be performed as living polymerizations, which give access to block copolymers.