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Isotactic‐specific polymerization of propene with an iron‐based catalyst: polymer end groups and regiochemistry of propagation
Author(s) -
Pellecchia Claudio,
Mazzeo Mina,
Pappalardo Daniela
Publication year - 1998
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/(sici)1521-3927(19981201)19:12<651::aid-marc651>3.0.co;2-e
Subject(s) - propene , regioselectivity , tacticity , catalysis , polymer , polymerization , polymer chemistry , end group , materials science , polymer science , chemistry , chemical engineering , organic chemistry , engineering
Prevailingly isotactic poly(propylene) samples were prepared with a homogeneous catalytic system based on a bis(imino)pyridyl Fe(II) derivative and methylaluminoxane. The polymer microstructure is in agreement with Bernoullian statistics of dyad formation, implicating a “chain‐end” mechanism of steric control. The latter is operative even at polymerization temperatures as high as +50°C. NMR analysis of polymer end groups indicates that chain growth proceeds via 2,1 monomer insertion. The last two findings are unprecedented for isotactic‐specific polymerization of propene and are reasonably related to each other.