Dialkylaluminum 2-substituted 6,6-dimethylcyclopentylpyridin-7-oxylates toward structural-differentiation of the ring-opening polymerization of ε-caprolactone and l-lactides

Dalton Transactions : an International Journal of Inorganic Chemistry
Dongzhi ZhuWen-Hua Sun

Abstract

Herein, a series of dialkylaluminum 2-substituted 6,6-dimethylcyclopentyl pyridin-7-oxylates Al1-Al7 were synthesized and characterized by 1H- and 13C-NMR spectroscopy and elemental analysis. The molecular structure of Al3 was proven to be a dimer of an aluminum complex. These aluminum complexes could efficiently initiate the ring-opening polymerization (ROP) of ε-caprolactone (CL), and the structural differentiations of the resultant PCL were strongly dependent on the amount of BnOH (PhCH2OH) used. In the absence of BnOH, the resultant PCL showed a cyclic structure, whereas BnO-capped linear PCL was obtained in the presence of >2.0 equivalents of BnOH; the resultant PCL was a mixture of linear and cyclic PCLs in the presence of 1.0 equivalent of BnOH. Moreover, these aluminum complexes exhibited high efficiency towards the ROP of l-lactide (LLA); however, the activities were lower than those for the ROP of ε-CL. Without BnOH, the resultant PLLA showed a highly linear structure with the alkyl-end group from aluminum complexes; on the other hand, PLLA displayed a major cyclic structure and minor BnO-capped linear PLLA if 1.0 equivalent of BnOH was employed, and the percentage of BnO-capped linear PLLA was increased by increasing...Continue Reading

References

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May 8, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Khamphee PhomphraiManat Pohmakotr
Feb 8, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Wen-Hua SunCarl Redshaw
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Feb 16, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Yun WeiShuangliu Zhou
May 11, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Peng WangXia Chen
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Jun 9, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Qiurui ZhangWen-Hua Sun

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Methods Mentioned

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