Formation of carbene and cyclopentadienylligands from phenylacetylenevia oligomerisation and CC bond scission at a mixed-metal W–Co centre

Abstract

The 1,2,4-triphenylcyclopentadienyl ligand and the CHR carbene ligand, bound respectively to the Co and W atoms in [(η⁵-C₅H₅)W{μ-CBu^t CC(CO₂Me)C(CO₂Me)CH}(μ-PPh ₂)Co(η⁵-C₅Ph₃H₂ )], are derived from the oligomerisation and cleavage of three molecules of phenylacetylene in the reaction of [(OC)(η⁵-C₅H₅)W{μ-C(CO₂ Me)CC(CC- Bu^t)(OMe)O}(μ-PPh₂)Co(CO)₂] with this acetylene.