Synthesis and Structure of Lanthanide Aryloxo Complexes and Their Polymerization Behavior for ϵ-Caprolactone

Authors

  • Lei Fang,

    1. Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China
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  • Yingming Yao,

    Corresponding author
    1. Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China
    • Yingming Yao, Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China, Fax: +86-512-65880305

      Yaorong Wang, Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China

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  • Yong Zhang,

    1. Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China
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  • Qi Shen,

    1. Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China
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  • Yaorong Wang

    Corresponding author
    1. Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China
    • Yingming Yao, Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China, Fax: +86-512-65880305

      Yaorong Wang, Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, P. R. China

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Abstract

Protic exchange reactions of bis(phenolate) lanthanide cyclopentadienyl complexes (C5H5)Ln(MBMP)(THF)2 [MBMP2– = 2,2′-methylene-bis(6-tert-butyl-4-methyl-phenolate)] with a series of mono-phenols (including 2,6-dimethylphenol, 4-tert-butylphenol, and 4-methoxyphenol) produce the lanthanide aryloxo complexes (MBMP)Ln(OC6H3-Me2-2,6)(DME)2 [Ln = La (1), Nd (2)], (MBMP)La(OC6H4-tBu-4)(DME)2 (3), [(MBMP)Nd(OC6H4-tBu-4)(THF)2]2 (4), and [(MBMP)Ln(OC6H4-OMe-4)(THF)2]2 [Ln = La (5), Nd (6)]. All of these complexes were well characterized by elemental analyses, IR spectra, and NMR in the cases of complexes 1, 3, and 5. The definitive molecule structures of complexes 1, 3, and 4 were determined by single-crystal X-ray diffraction. The catalytic behavior of complexes 16 for the ring-opening polymerization of ϵ-caprolactone was explored.

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