112840-73-0Relevant academic research and scientific papers
Synthesis and Reactivity of (η3-Allyl)(η5-pentamethylcyclopentadienyl)cobalt(II) and its Derivatives
Nehl, Hans
, p. 1519 - 1528 (2007/10/02)
Reaction of (η5-pentamethylcyclopentadienyl)cobalt(II) chloride (1) with allyllithium- or allylmagnesium compounds leads to new (η3-allyl)(η5-pentamethylcyclopentadienyl)cobalt(II) complexes 2a-d.Complex 2a reacts with acetonitrile by oxidative addition of a methyl group to cobalt to form 5.With alkynes complexes with cyclodimerized or -trimerized alkynes as ligands are formed, e.g. the tetraphenylcyclobutadiene complex 6 from 2a and tolan and the hexamethylbenzene complex 8 from 2a and 2-butyne.Reaction with phenylethyne catalytically leads to triphenylbenzene 10.The complexes 2a-d are oxidized by iodine and bromine to Co(III) iodides 12a-d and bromides 14a and b, and by ferricenium tetrafluoroborate to the tetrafluoroborates 13a-c.The tetrafluoroborates give with nitriles stable complexes (nitrile-coordinated end-on to Co), with alkynes substituted cyclopentadienyl ligands coordinated to Co are formed by cycloaddition of the allkyl group and the alkyne.Key Words: Cobalt(II), (η3-alkyl)(η5-pentamethylcyclopentadienyl)complexes / Cyclodimerisation and trimerisation reactions / Cycloaddition reactions / Allyl complexes
