期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 10, 页码 2714-2719出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201611066
关键词
polar monomers; sequence regulation; styrene; syndioselective copolymerization; yttrium
资金
- NSFC [21634007, 21674108, 21374112, 21304088]
- 973 Project [2015CB654700]
Styrene underwent unprecedented coordinationinsertion copolymerization with naked polar monomers (ortho-/ meta-/ para-methoxystyrene) in the presence of a pyridyl methylene fluorenyl yttrium catalyst. High activity (1.26 X 10(6) gmol(Y)(- 1)h (-1)) and excellent syndioselectivity were observed, and high-molecular-weight copolymers (24.6 X 10(4) gmol (-1)) were obtained. The insertion rate of the polar monomers could be adjusted in the full range of 0-100% simply by changing the loading of the polar styrene monomer. Strikingly, the copolymers had tapered, gradient, and even random sequence distributions, depending on the position of the polar methoxy group on the phenyl ring and thus on its mode of coordination to the active metal center, as shown by tracking the polymerization process and DFT calculations.
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