Abstract
Reactivity of N-protected 2-amino- or 2-imino-functionalized pyrroles with aluminum alkyls was investigated, resulting in the isolation of a series of aluminum alkyl complexes. Treatment of 2-imino-functionalized pyrrole with AlMe3 produced only imino-coordinated aluminum complex 1-Bn-2-(2,6-iPr2C6H3N═CH)C4H3NAlMe3 (1), while reactions of N-protected 2-amino-functionalized pyrroles with aluminum alkyls produced the aluminum alkyl complexes {[η1-μ-η1:η1-1-R1-2-(2,6-iPr2C6H3NCH2)C4H2N]AlR}2 (R1 = Bn, R = Me (2); R1 = Bn, R = Et (3); R1 = R = Me (4); R1 = Me, R = Et (5)), bearing 3-carbon bonded pyrrolyl ligands via C–H σ-bond metathesis reaction. Further reactions of complexes 2–5 with a stoichiometric amount of isopropyl alcohol (iPrOH) afforded the corresponding aluminum alkoxide complexes [1-R1-2-(2,6-iPr2C6H3NCH2)C4H3NAlR(μ-OiPr)]2 (R1 = Bn, R = Me (6); R1 = Bn, R = Et (7); R1 = R = Me (8); R1 = Me, R = Et (9)) through selective cleavage of the Al–C (Pyr) bonds. The solid-state structures of the aluminu...
Published Version
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