Magnesium complexes containing η1- and η3- pyrrolyl or ketiminato ligands: Synthesis, structural investigation and ε-caprolactone ring-opening polymerisation

Li Feng Hsueh, Nien Tsu Chuang, Cheng Yuan Lee, Amitabha Datta, Jui Hsien Huang, Ting Yu Lee

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Abstract

A series of dimeric magnesium derivatives containing substituted pyrrolyl or ketiminato ligands was synthesised and the application of these derivatives for the ring opening polymerisation of ε-caprolactone has been carried out. Reactions of [Mg{N(SiMe3)2}]2 (1) with one equiv. of 2-dimethylaminomethyl pyrrole and 2-diethylaminomethyl pyrrole in toluene generates [Mg{C4H3N(2-CH2NMe 2)}{N(SiMe3)2}]2 (2) and [Mg{C 4H3N(2-CH2NEt2)}{N(SiMe 3)2}]2 (3), respectively, in high yield. Similarly, the reaction of 1 with one equiv. of 2-tert-butylaminomethyl pyrrole in toluene at room temperature affords [Mg{C4H3N(2-CH 2NHtBu)}{N(SiMe3)2}]2 (4). Furthermore, reactions of 1 with one equiv. of HOCMeCHCMeN(C6H 3-2,6-iPr2) or HOCMeCHCMeN(C6H 4-2-OMe) in toluene yielded the dimeric magnesium complexes, [Mg{OCMeCHCMeN(C6H3-2,6-iPr2)}{N(SiMe 3)2}]2 (5) and [Mg{OCMeCHCMeN(C 6H4-2-OMe)}{N(SiMe3)2}]2 (6), respectively, in satisfactory yields by means of deamination. All the complexes were characterised by NMR spectroscopy and X-ray diffraction analysis in the solid state. They show moderate reactivity towards the ring opening polymerisation of ε-caprolactone in dichloromethane or tetrahydrofuran. A series of dimeric magnesium derivatives containing substituted pyrrolyl or ketiminato ligands was synthesised and the compounds were evaluated as catalytic precursors. The complexes show moderate reactivity towards the ring opening polymerisation of ε-caprolactone in dichloromethane or tetrahydrofuran.

Original languageEnglish
Pages (from-to)5530-5537
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Issue number36
DOIs
Publication statusPublished - 2011 Dec 1

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All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

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