The synthesis of a helical ferrocene

Helical Porphyrinoids: Incorporation of Ferrocene Subunits into Macrocyclic Structures

“…[25,26] A particularly striking example of a helical ferrocene derivative is provided by the helicene complex 2, first reported by Katz and coworkers. [27,28] This system, in which the iron atom is bound by a single fully π-conjugated ligand, demonstrates a structural paradigm that can potentially be extended to porphyrinoid chemistry. Specifically, one can envisage molecules of the general structure 3 (Scheme 1) which combine biliverdin-type helicity with that of 1,1Ј-disubstituted ferrocene.…”

Fixing the Chirality and Trapping the Transition State of Helicene with Atomic Metal Glue

“…For example, iron has been inserted into a substituted helicene in analogy with ferrocene, [51,52,53] and alkali metal ions have been suggested to form stable complexes with the helicenes. [54] It has also been suggested that suitable substitutions of the hydrogen atoms of the terminal aryl groups could allow for transition metal complexation between the added functional groups.…”

[6]Helicene as a novel molecular tweezer for the univalent silver cation: Experimental and theoretical study

“…This makes them chiral even though they have no center of chirality. The highly delocalized large p-electron system of fully aromatic helicenes along with the previously mentioned inherent chirality predetermines their unique optical [17] and electronic [18] properties, as well as their use in many fields of research including supramolecular chemistry [19][20][21][22][23][24], molecular recognition [25,26], and asymmetric organo-or transition metal catalysis [27,28].…”