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Regio‐ and Stereochemical Control in Ocimene Polymerization by Half‐Sandwich Rare‐Earth Metal Dialkyl Complexes
Author(s) -
Peng Deqian,
Du Gaixia,
Zhang Pengfei,
Yao Bo,
Li Xiaofang,
Zhang Shaowen
Publication year - 2016
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201600102
Subject(s) - polymerization , cyclopentadienyl complex , selectivity , metal , stereoselectivity , tacticity , polymer chemistry , ligand (biochemistry) , chemistry , materials science , stereochemistry , polymer , organic chemistry , catalysis , biochemistry , receptor
The polymerization of ocimene has been first achieved by half‐sandwich rare‐earth metal dialkyl complexes in combination with activator and Al i Bu 3 . The regio‐ and stereoselectivity in the ocimene polymerization can be controlled by tuning the cyclopentadienyl ligand and the central metal of the complex. The chiral cyclopentadienyl‐ligated Sc complex 1 prepares syndiotactic cis ‐1,4‐polyocimene ( cis ‐1,4‐selectivity up to 100%, rrrr = 100%), while the corresponding Lu, Y, and Dy complexes 2 – 4 and the achiral pentamethylcyclopentadienyl Sc, Lu, and Y complexes 5 – 7 afford isotactic trans ‐1,2‐polyocimenes ( trans ‐1,2‐selectivity up to 100%, mm = 100%).