Ruthenium complexes of sterically-hindered pentaarylcyclopentadienyl ligands

Abstract

Preparation of chlorine functionalised intermediates has been developed which is well adapted for highly sterically hindered compounds both with either electron rich or poor systems.

Procrystalline Self-Assembly of Desymmetrized Pentaphenylcyclopentadiene

“…The methyl and fluoro-functionalized Cp were obtained with an overall yield of 35% and 32%, respectively (see the Supporting Information for more details and characterization). The brominated Cp were obtained as a mixture of three regioisomers due to a unimolecular nucleophilic substitution (S N 1) mechanism, 34,35 however, the three regioisomers can be converted into the same radical species during sublimation by cleaving the C−Br bonds (Scheme 1) like it has been shown on a molecule with a common bromocyclopentadiene subunit. 36 5-Me was deposited on a clean Au(111) surface kept at room temperature (Figure 1a).…”