Reactions of metallocenes with potassium and potassium amide in liquid ammonia

Isolation and electronic structures of derivatized manganocene, ferrocene and cobaltocene anions

“…The synthetic methodology presented herein should be transferable to other d-block metallocenates with appropriate functionalization. We note that these results come over 50 years after the first published efforts to reduce ferrocene with alkali metals 51 . In the first report of the electrochemical reduction of cobaltocene in 1974, Geiger predicted that metallocene anions would be interesting candidates to study electrophilic attack at metallocene centres 14 ; such reactivity studies on structurally authenticated ferrocene monoanions are now plausible.…”

Synthesis and structure of (η5-cyclopentadienyl)(η5-(1-(η5-cyclopentadienyl)-2-phenyl-3-methyl-1-nickelaindenyl)nickel – the first analogue of nickelocene with a nickelacyclopentadienyl ring

“…doi:10.1016 /j.jorganchem.2004.11.056 by cyclopentadienylnickel species formed during reduction of nickelocene. Earlier reductions of nickelocene were carried out using such reducing agents as organolithium or organomagnesium compounds [3,4], Na(Hg)/ROH [5], K/liquid NH 3 [6] or sodium naphthalenide in THF [7].…”

ansa-metallocene derivatives

“…While molybdocene and tungstenocene form a great variety of ligand derivatives, coordinative adducts of chromocene are rare, and none of those reported are thermally stable. Wilkinson, Cotton and Birmingham observed the formation of NH3 adducts of (CsHshCr in liquid ammonia [2]; at ambient temperatures (CsHshCr is regenerated from these complexes [3]. Later, we found that (CsHshCr is quantitatively converted to the diamagnetic adduct (CsHshCr(CO) by reaction with CO in pentane at -78°C [4]; at room temperature, however, the CO dissociation pressure rises above 100 mbar.…”