Stereospecific Styrene Enchainment at a Titanium Site within a Helical Ligand Framework: Evidence for the Formation of Homochiral Polystyrene

Tactful: Titanium catalyst precursors in both optically active, enantiomeric forms have been obtained diastereoselectively, and after activation with methylaluminoxane (MAO) they were used for the stereospecific oligomerization of styrene. The isotactic polystyrenes with a degree of polymerization o...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2007-01, Vol.46 (25), p.4790-4793
Main Authors: Beckerle, Klaus, Manivannan, Ramanujachary, Lian, Bing, Meppelder, Geert-Jan M., Raabe, Gerhard, Spaniol, Thomas P., Ebeling, Henner, Pelascini, Frederic, Mülhaupt, Rolf, Okuda, Jun
Format: Article
Language:English
Subjects:
asymmetric catalysis
chirality
Ligands
Magnetic Resonance Spectroscopy
Nanotechnology
polymerization
Polystyrenes - chemistry
Stereoisomerism
tacticity
titanium
Titanium - chemistry
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Summary:Tactful: Titanium catalyst precursors in both optically active, enantiomeric forms have been obtained diastereoselectively, and after activation with methylaluminoxane (MAO) they were used for the stereospecific oligomerization of styrene. The isotactic polystyrenes with a degree of polymerization of up to 45 show measurable optical activity, thus corroborating that enantiomorphic site control is operating in these homogeneous catalysts.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.200700783