Ligand exchange and abstraction reactions involving titanium isopropoxide with tris (pentafluorophenyl) borane and-alane: ramifications for ring-opening …

A Rodriguez-Delgado, EYX Chen

Index: Rodriguez-Delgado, Antonio; Chen, Eugene Y.-X. Inorganica Chimica Acta, 2004 , vol. 357, # 13 p. 3911 - 3919

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Citation Number: 14

Abstract

In situ mixing of Ti (OiPr) 4 and B (C6F5) 3 generates a very efficient catalyst system for ring- opening polymerization (ROP) of propylene oxide (PO) with a turnover frequency (TOF)> 1350/h, whereas the mixture of Ti (OiPr) 4 and Al (C6F5) 3 is inactive for the same polymerization. The inactivity of the Ti (OiPr) 4/Al (C6F5) 3 mixture is due to the formation of the stable isopropoxy-bridged bimetallic species Ti (OiPr) 3 (μ-OiPr) Al (C6F5) 3 (1), the ...