Ring Strain Perturbation of the Equilibria between Hydroxycarbene Complexes and Metal Acyl Hydride Complexes

摘要

The acyl anion complex [(CO)_2ReC(=O)CH_2CH_2(η~5-C_5H_4)]~-Li~+ (7) in which a two-carbon tether links the cyclopentadienyl ring to the acyl carbon was synthesized by attachment of a 2-lithioethyl side chain to the cyclopentadiene ring of CpRe(CO)_3 followed by intramolecular attack of the lithium reagent on a carbonyl group.