text: The "tuck-in" process is related to ortho-metalation in the sense that it is an intramolecular cyclometalation.  Tuck-in complexes derived from Cp* ligands are derivatives of tetramethylfulvene, sometimes abbreviated MeFv.  A variety of complexes are known for MeFv and related ligands.  In these complexes, the Fv can serve as a 4-electron or as a 6-electron ligand.