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Cover Picture: Nickel α‐Keto‐β‐Diimine Initiators for Olefin Polymerization (Angew. Chem. Int. Ed. 6/2009)
Author(s) -
Azoulay Jason D.,
Rojas Rene S.,
Serrano Abigail V.,
Ohtaki Hisashi,
Galland Griselda B.,
Wu Guang,
Bazan Guillermo C.
Publication year - 2009
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200990016
Subject(s) - cationic polymerization , diimine , chemistry , catalysis , lewis acids and bases , electrophile , lone pair , polymer chemistry , polymerization , nickel , reactivity (psychology) , olefin fiber , ligand (biochemistry) , transition metal , photochemistry , medicinal chemistry , organic chemistry , polymer , molecule , medicine , biochemistry , alternative medicine , receptor , pathology
Modification of a ligand framework by the introduction of an exocyclic carbonyl group (highlighted in red) results in a remarkable increase in the activity of a nickel olefin polymerization catalyst. As described by G. C. Bazan and co‐workers in the Communication on page 1089 ff., the oxygen lone pairs allow Lewis acids to withdraw electron density from the cationic active site. Such modulation of electronic effects allows the reactivity of electrophilic transition‐metal active sites to be tuned.