A simple synthesis of group 2 anthracenides and their use as reducing agents for polypnictogen ligand complexes.

Authors

Lukas Adlbert, Martin Weber, Christoph Riesinger, Michael Seidl, Manfred Scheer

Published in

Chemical science. Jul 24, 2025. Epub Jul 24, 2025.

Abstract

By using an improved synthetic pathway, the anthracenides of the group 2 metals Ca, Sr, and Ba are straightforwardly accessible for subsequent organometallic syntheses. These highly reactive compounds are slightly soluble in tetrahydrofuran and can be used as synthons for group 2 metal transfer due to the lability of the anthracene substituent. These features were used to explore their reactivity towards the polyphosphorus ligand complexes [Cp*Fe(η⁵-P₅)] (Cp* = C₅(CH₃)₅) and [Cp*Fe(η^3:1-(1-CH₃-2-PPh₂-P₅))], respectively. The resulting products, [Cp*Fe(μ-η^4:2:1-P₅)Mg(thf)₃] 0.5 thf (thf = tetrahydrofuran) and [{Cp*Fe(μ-η^2:2:1-(1-CH₃-2-PPh₂-P₅))}₂Mg(thf)₂]·3 thf, are first examples of molecular magnesium-containing polypnictogenide transition metal complexes without stabilization by N-donor ligands that are soluble in organic N-donor-free solvents. The P₁₂ ligand in the latter complex is the first example of a 2,2'-diphosphanyl-substituted decaphosphadihydrofulvalen-shaped structural motif (2,2'-bis(diphenylphosphanyl)-1,1'-dimethyl-3,3'-bipentaphosphole). The complexes [Cp*Fe(μ₃-η^4:4:1-P₅)Sr(thf)₄]₂·2 thf and [Cp*Fe(μ₃-η^2:1:1:1:1-(1-CH₃-2-PPh₂-P₅))Sr(thf)₃]₂·2 thf represent the first examples of molecular polypnictogen compounds of strontium that are stable in organic solvents.

PMID:
40735679
Bibliographic data and abstract were imported from PubMed on 30 Jul 2025.

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