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The title compound [( N , N -di-methyl-amino)-meth-yl]ferrocene, [Fe(C 5 H 5 )(C 8 H 12 N)], ( 1 ), is an inter-esting starting material for the synthesis of planar chiral 1,2-disubstituted ferrocenes, as demonstrated by the preparation of ( R  p , R  p )-bis-{2-[(di-methyl-amino)-meth-yl]ferrocen-yl}di-methyl-silane, [Fe 2 (C 5 H 5 ) 2 (C 18 H 18 N 2 Si)], ( 2 ), from the li-thia-ted derivative of 1 . The configuration of the lithium compound is unchanged after the substitution reaction and the chirality is preserved in space group P 2 1 2 1 2 1 . In both compounds, the Cp rings adopt eclipsed conformations. Hirshfeld surface analysis was used to investigate the inter-molecular inter-actions, and showed that H⋯H (van der Waals) inter-actions dominate in both structures with contact percentages of 83.9 and 88.4% for 1 and 2 , respectively.

acta crystallographica. section e, crystallographic communications

Crystal structures of [(N,N-dimethylamino)methyl]ferrocene and (R p,R p)-bis{2-[(dimethylamino)methyl]ferrocenyl}dimethylsilane