Pentaisopropyl Cyclopentadienyl: An Overview across the Periodic Table

Cyclopentadienide (Cp) groups are among the most popular ligands in organometallic chemistry. Sterically demanding substitution patterns on the Cp ring can have an important effect on the ligand properties and there are many examples of metal complex which are only stable and isolatable with sterically demanding Cp ligands, carrying alkyl or aryl groups. Among these sterically demanding Cp ligands, pentaisopropylcyclopentadienide is the bulkiest pentaalkyl derivative and has been utilized in main group, as well as transition metal and rare-earth element chemistry for several decades.