Synthesis of a Hexameric Magnesium 4-pyridyl Complex with Cyclohexane-like Ring Structure via Reductive C-N Activation

Samuel R Lawrence; Matthew de Vere-Tucker; Alexandra M Z Slawin; Andreas Stasch

doi:10.3390/molecules26237214

Synthesis of a Hexameric Magnesium 4-pyridyl Complex with Cyclohexane-like Ring Structure via Reductive C-N Activation

Molecules. 2021 Nov 28;26(23):7214. doi: 10.3390/molecules26237214.

Authors

Samuel R Lawrence¹, Matthew de Vere-Tucker¹, Alexandra M Z Slawin¹, Andreas Stasch¹

Affiliation

¹ EaStCHEM School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK.

Abstract

The reaction of [{(^Arnacnac)Mg}₂] (^Arnacnac = HC{MeC(NAr)}₂, Ar = 2,6-diisopropylphenyl, Dip, or 2,6-diethylphenyl, Dep) with 4-dimethylaminopyridine (DMAP) at elevated temperatures afforded the hexameric magnesium 4-pyridyl complex [{(^Arnacnac)Mg(4-C₅H₄N)}₆] via reductive cleavage of the DMAP C-N bond. The title compound contains a large s-block organometallic cyclohexane-like ring structure comprising tetrahedral (^Arnacnac)Mg nodes and linked by linear 4-pyridyl bridging ligands, and the structure is compared with other ring systems. [(^Dipnacnac)Mg(DMAP)(NMe₂)] was structurally characterised as a by-product.

Keywords: X-ray crystallography; bond activation; low oxidation state complexes; magnesium; metallacycles; ring system.

Abstract

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