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Synthesis of N‑Heterocycle Substituted Silyl Ligands within the Coordination Sphere of Iron

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posted on 10.09.2018, 12:20 by Léon Witteman, Martin Lutz, Marc-Etienne Moret
N-Heterocycle-substituted silyl iron complexes have been synthesized by nucleophilic substitution at trichlorosilyl ligands bound to iron. The homoleptic (tripyrrolyl)- and tris­(3-methylindolyl)­silyl groups were accessed from (Cl3Si)­CpFe­(CO)2 (Cl3SiFp) by substitution of chloride with pyrrolide or 3-methylindolide, respectively. Analogously, nucleophilic substitution of Cl with pyrrolide on the anionic Fe(0) synthon Cl3SiFe­(CO)4 generates the (tripyrrolyl)­silyl ligand, bound to the iron tetracarbonyl fragment. The bulkier 2-mesitylpyrrolide substitutes a maximum of 2 chlorides on Cl3SiFp under the same conditions. The tridentate, trianionic nucleophile tmim (tmimH3 = tris­(3-methylindol-2-yl)­methane) proves reluctant to perform the substitution in a straightforward manner; instead, ring-opening and incorporation of THF occurs to form the tris-THF adduct tmim­(C4H8O)3SiFe­(CO)4. The bidentate, monoanionic nucleophile 2-(dipp-iminomethyl)­pyrrolide (DippIMP, dipp = 2,6-diisopropylphenyl) shows chloride displacement and addition of a second DippIMP moiety on the imine backbone. The heterocycle-based silyl ligands were shown to be sterically and electronically tunable, moderately electron-donating ligands. The presented approach to new silyl ligands avoids strongly reducing conditions and potentially reactive hydrosilane intermediates.