Aluminum complexes of a hemilabile pyrrolylaldiminate ligand

Author:

Lee Pei‐Ying1,Lin Yu‐Hsuan1,Liang Lan‐Chang123ORCID

Affiliation:

1. Department of Chemistry National Sun Yat‐sen University Kaohsiung Taiwan

2. Department of Medicinal and Applied Chemistry Kaohsiung Medical University Kaohsiung Taiwan

3. School of Pharmacy Kaohsiung Medical University Kaohsiung Taiwan

Abstract

AbstractOverviewThis study describes the synthesis, characterization, and reactivity of aluminum complexes containing the amine‐functionalized pyrrolylaldiminate ligand N‐(2‐dimethylaminoethyl)‐5‐tert‐butyl‐pyrrol‐2‐ylaldiminate ([PyImN]−).SynthesisThe condensation reaction of N,N‐dimethylethylenediamine with 5‐tert‐butylpyrrole‐2‐carbaldehyde in methanol at room temperature produces H[PyImN]. Alkane elimination reactions of MeAlCl2 with H[PyImN] in toluene at 110°C and AlR3 (R = Me, Et) with H[PyImN] in toluene at −35°C afford [PyImN]AlCl2 and [PyImN]AlR2, respectively.CharacterizationSolution NMR studies reveal the coordination preferences of [PyImN]—whose hemilabile amine donor is bound to the aluminum center in [PyImN]AlCl2 but unbound in [PyImN]AlR2 (R = Me, Et).CatalysisThe catalytic activities of [PyImN]AlMe2 in controlled ring‐opening polymerization of ε‐caprolactone are discussed.

Funder

National Science and Technology Council

Publisher

Wiley

Subject

General Chemistry

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