page_title: Tuck-in complex
section_title: Scope and bonding
hierarchical_section_title: Tuck-in complex / Scope and bonding
caption_attribution_description: English: two fulvene complexes
context_page_description: In organometallic chemistry, a tuck-In complex usually refers to derivatives of Cp* ligands wherein a methyl group is deprotonated and the resulting methylene attaches to the metal. The C₅-CH₂-M angle is acute. The term "tucked-in" was coined to describe derivatives of organotungsten complexes. Although most "tucked-in" complexes are derived from Cp* ligands, other pi-bonded rings undergo similar reactions.
context_section_description: 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 Me₄Fv.  A variety of complexes are known for Me₄Fv and related ligands.  In these complexes, the Fv can serve as a 4-electron or as a 6-electron ligand.
caption: η4- and η6-fulvene complexes.
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