期刊
DALTON TRANSACTIONS
卷 48, 期 13, 页码 4157-4167出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9dt00137a
关键词
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资金
- National Natural Science Foundation of China [51473170, 51273202]
- Chinese Academy of Sciences President's International Fellowship Initiative [2018PM0012]
- advanced research program (Tokyo Metropolitan government, Tokyo Metropolitan University)
Herein, a series of dialkylaluminum 2-substituted 6,6-dimethylcyclopentyl pyridin-7-oxylates Al1-Al7 were synthesized and characterized by H-1-and C-13-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 e-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 epsilon-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 the amount of BnOH.
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