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Dichloromethane as a Selective Modifying Agent To Create a Family of Highly Reactive Chromium Polymerization Sites
Author(s) -
Nenu Cristina N.,
Groppo Elena,
Lamberti Carlo,
Beale Andrew M.,
Visser Tom,
Zecchina Adriano,
Weckhuysen Bert M.
Publication year - 2007
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200602593
Subject(s) - dichloromethane , polymerization , chromium , catalysis , chemistry , remainder , polymer chemistry , fraction (chemistry) , combinatorial chemistry , organic chemistry , polymer , solvent , arithmetic , mathematics
Uniform polymerization sites with high activity can be created by treating a Phillips‐type Cr II /SiO 2 catalyst with CH 2 Cl 2 (as shown schematically in the picture) under well‐defined conditions. A mechanism is proposed in which CH 2 Cl 2 increases the catalytic activity of a small fraction of Cr sites while poisoning the remainder.