Aluminum compounds containing η1- and/or η5-bidentate dianionic pyrrolyl-methylamide ligands

Ya Chi Chen, Che Yu Lin, Chun Yin Li, Jui-Hsien Huang, Ling Chueh Chang, Ting Yu Lee

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Abstract

A series of dialuminum compounds have been synthesized and their reactivity and application for lactide polymerization have been studied. The reaction of AlH3·NMe3 with [C4H3NH(2- CH2NHtBu)] in diethyl ether generated a dimeric aluminum hydride compound, [{[C4H3N(2-CH2NtBu)]AlH}2] (1). The structure of 1 was confirmed by spectroscopy of a deuterated analogue of 1 with an Al-D function. Direct treatment of [C4H 3NH(2-CH2NHtBu)] with LiAlH4 in diethyl ether resulted in colorless crystals of [{Li[μ-η15- C4H3N(2-CH2NtBu)]2Al}2] (2) in 80% yield after recrystallization from a toluene solution. The μ-η15-pyrrolyl protons exhibit high-field shifts at δ=5.73, 6.15, and 6.72 comparable to a similar η5-bonding mode in the literature. Treatment of 1 with 1 equiv acetone oxime or acetone in dichloromethane gave [{[C4H 3N(2-CH2NtBu)]Al-[κO,κN-(ON=CMe 2)]}2] (3) and [{[C4H3N(2-CH 2NtBu)]Al(O-CHMe2)}2] (4) in 67% and 60% yield, respectively. Compounds 1-4 have been characterized by X-ray diffractometry and were used as catalysts for ε-caprolactone polymerization.

Original languageEnglish
Pages (from-to)9747-9753
Number of pages7
JournalChemistry - A European Journal
Volume14
Issue number31
DOIs
Publication statusPublished - 2008 Oct 29

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

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