Metal derivatives

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carbyne metal complexes: See metal-carbyne complexes.

ferrocenophanes:

Compounds in which the two ring components of ferrocene are linked by one or more bridging chains. See also cyclophanes, metallocenes, sandwich compounds.

Grignard reagents:

Organomagnesium halides, RMgX, having a carbon-magnesium bond (or their equilibrium mixtures in solution with R₂Mg⁺ MgX₂).

metal-carbene complexes:

Metal complexes of the type R₂CML_n (M = metal, L = ligand) in which formally a carbene is coordinated to a metal. E.g.

metal-carbyne complexes:

Metal complexes of the type RCML_n (M = metal, L = ligand) in which formally a carbyne is coordinated to a metal. E.g.

metallacycloalkanes:

Monocyclic compounds containing a metal atom and saturated carbon atoms as ring members.

E.g. L is a ligand, e.g. triphenylphosphane.

metallocenes:

Organometallic coordination compounds in which one atom of a transition metal such as iron, ruthenium or osmium is bonded to and only to the face of two cyclopentadienyl [⁵-(C₅H₅)] ligands which lie in parallel planes. NOC Rule D-2.55. The term should not be used for analogues having rings other than cyclopentadienyl as ligands.

organo-: See organometallic compounds.

organometallic compounds:

Classically compounds having bonds between one or more metal atoms and one or more carbon atoms of an organyl group. Organometallic compounds are classified by prefixing the metal with organo-, e.g. organopalladium compounds. In addition to the traditional metals and semimetals, elements such as boron, silicon, arsenic and selenium are considered to form organometallic compounds. E.g. organomagnesium compounds: MeMgI iodo(methyl)magnesium, Et₂Mg diethylmagnesium; an organolithium compound: BuLi butyllithium; an organozinc compound: ClZnCH₂C(=O)OEt chloro(ethoxycarbonylmethyl)zinc; an organocuprate: Li⁺[CuMe₂]^- lithium dimethylcuprate; an organoborane: Et₃B triethylborane. The status of compounds in which the canonical anion has a delocalized structure in which the negative charge is shared with an atom more electronegative than carbon, as in enolates, may vary with the nature of the anionic moiety, the metal ion, and possibly the medium; in the absence of direct structural evidence for a carbon-metal bond, such compounds are not considered to be organometallic. See acetylides, ferrocenophanes, Grignard reagents, metallocenes.

sandwich compounds:

Compounds in which a metal atom is located between the faces of two parallel and planar (or nearly so) ring structures. See also metallocenes. E.g. bis(⁵-cyclopentadienyl)iron (ferrocene), dibenzenechromium.