In the last two decades there has been growing interest in transition metal (TM) free, small molecule activation, mediated by frustrated Lewis pairs (FLP). In order to better understand the small molecule reactivity of multiple FLP moieties reacting in close proximity we developed a model system comprised of two boramidinate functional groups tethered by a flexible ferrocene linker. The 1,1’-bis(boramidinate)ferrocene model can be prepared from 1,1’-dicarbodiimidoferrocenes and different electrophilic boranes. Careful synthetic control of the substituents at the FLP allows for the sequential capture of different gaseous small molecules (CO2 and CO or CO2 and CNtBu) by the same bis(boramidinate)ferrocene molecule.

Ferrocene tethered boramidinate frustrated Lewis pairs: Model platform for sequential small molecule capture

ACS Spring 2022

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