An aluminium–oxygen compound containing Al–O–Al connectivity, often represented compositionally as . Electron-deficient aluminium can achieve four-coordinate environments through cage assembly and multiply bridging oxygen.
A neutral piano-stool complex , conventionally chromium(0), with 18 valence electrons. arene substitution changes electron density and carbonyl stretching frequencies.
A lithium cuprate conventionally represented as LiCuR₂. Its actual structure can be an aggregate and depends on ligand identity, solvent and salts.
A carbon fragment doubly bonded to a metal in the present organometallic usage. Metal–alkylidene exchange with an alkene underlies olefin metathesis.
An organocopper reagent capable of carbon-group transfer. Suitable organocuprates can favour conjugate addition to an enone over direct addition to its carbonyl.
An allylic organotitanium species that can add its allyl group to a carbonyl compound, furnishing a homoallylic alcohol after hydrolysis.
A four-membered titanium–oxygen–carbon–carbon intermediate in carbonyl olefination. Fragmentation yields a carbon–carbon double bond and a titanium–oxygen product.
A four-membered metallacycle containing titanium and three carbon atoms. Cycloreversion can exchange an alkene and a titanium alkylidene; other eliminations become available with suitable substituents.
The reactive early-metal alkylidene . carbonyl methylenation proceeds through an oxatitanacyclobutane; alkene capture gives a titanacyclobutane. Its oxygen affinity makes ester methylenation feasible.
An oligomeric aluminium–oxygen reagent used to alkylate and ionize metallocene polymerization catalysts.
A three-membered metal–carbon–carbon bonding description obtained in the strong alkene-reduction limit. It emphasizes metal–carbon sigma bonding and reduced internal C–C bond order.
A three-membered metal–carbon–carbon ring description with substantial metal–carbon sigma bonding and reduced alkyne bond order.
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