Reversible Expansion and Contraction of a 1,2‐Diborylated Ferrocene Dimer Promoted by Redox Chemistry and Nucleophile Binding

Two Bs in a pod: The first 1,2-diborylated ferrocene (see structure) was obtained upon reaction of PhBCl2 with 1,1′-bis(trimethylstannyl)ferrocene. Conformational changes in this highly rigid species are triggered either through redox chemistry or the binding of nucleophiles, to render the complex an interesting candidate for the design of new types of molecular machines.