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Front Cover: Internal Donors in Ziegler–Natta Systems: is Reduction by AlR 3 a Requirement for Donor Clean‐Up? (ChemCatChem 5/2018)
Author(s) -
Zaccaria Francesco,
Vittoria Antonio,
Correa Andrea,
Ehm Christian,
Budzelaar Peter H. M.,
Busico Vincenzo,
Cipullo Roberta
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800269
Subject(s) - steric effects , catalysis , chemisorption , chemistry , adsorption , natta , front cover , cover (algebra) , polymer chemistry , materials science , chemical engineering , organic chemistry , polymerization , polymer , engineering , mechanical engineering
The Front Cover shows the reaction deck of a glove‐box‐contained robotic platform used to investigate the chemisorption of Al‐alkyls and organic donors on the surface of MgCl 2 ‐supported Ziegler–Natta catalysts for the industrial production of isotactic polypropylene. In this complex catalysis, Al‐alkyls are used to alkylate and reduce the inherently chiral but sterically open surface Ti precursor species; and one or more organic donors co‐adsorbed at neighboring surface locations impart the necessary steric hindrance to the active sites, thus mimicking ancillary ligands in molecular catalysts. In their Full Paper, F. Zaccaria et al. elucidate the different routes and mechanisms that can be exploited to steer this delicate operation of surface modification.