Synthesis and Characterization of Titanium 7‐Azaindolato Complexes and their Lithium Precursors

Abstract

AbstractTwo differently 2‐substituted 7‐azaindoles (substituent = H (1‐H), t‐Bu (1‐tBu)) react with n‐butyllithium in tmeda to give different Li complexes. Using the ligand 1‐H, the binuclear complex [(tmeda)Li(azH)]2 (2‐H) is formed. The sterically more demanding ligand 1‐tBu leads to formation of the mononuclear Li complex (tmeda)Li(aztBu) (2‐tBu). The decamethyltitanocene bis(trimethylsilyl)acetylene complex Cp*2Ti(η2‐Me3SiC2SiMe3) (3a) reacts with 7‐azaindole (1‐H) to give the dark red titanocene(III) complex 4. Using the sterically more demanding 1‐tBu ligand upon deprotonation with dialkylmagnesium, followed by subsequent salt metathesis with (Cp2TiCl)2, the dark green titanocene(III) heterometallacyclic complex 5 is obtained. Complexes 2‐H, 2‐tBu and 5 were characterized by X‐ray analyses.