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http://dx.doi.org/10.5012/bkcs.2009.30.3.636

Novel and Efficient Palladium Complexes with β-Ketoiminate Ligands for the Polymerization of Norbornene  

Lee, Dong-Hwan (Department of Chemistry, Inha University)
Hwang, Yoon-Joo (Department of Chemistry, Inha University)
Yoon, Jin-San (Department of Polymer Engineering, Inha University)
Choi, Moon-Kun (Department of Chemistry, Yonsei University)
Lee, Ik-Mo (Department of Chemistry, Inha University)
Publication Information
Bulletin of the Korean Chemical Society / v.30, no.3, 2009 , pp. 636-646 More about this Journal
Abstract
A series of the noble palladium complexes containing $\beta$-ketoiminate ligands with internal bases, [Pd(${\eta}^3$-allyl)($\beta$- ketoiminate)], [Pd(Me)($PPh_3$)($\beta$-ketoiminate)] and [Pd(Me)($\beta$-ketoiminate)], have been successfully prepared. Crystallographically determined structures showed that these complexes are distorted square planar and pendant bases of the $\beta$-ketoiminate ligands fail to coordinate to the metal in the first two classes of complexes while bases do coordinate in the 3rd class complexes. These complexes are active towards norbornene polymerization on activation with $H(OEt_2)_2BAr^ (Ar' = 3,5-bistrifluoromethylphenyl) and modified methylalumioxane (MMAO). MMAO is more efficient for the activation for polymerization. Generally, the polymerization activity increases with the following order; [Pd(allyl)($\beta$-ketoiminate)] < [Pd(Me)($PPh_3$)($\beta$-ketoiminate)] < [Pd(Me)($\beta$-ketoiminate)].
Keywords
Palladium complexes; $\beta$-Ketoiminate ligands; Norbornene polymerization; Activators; Structures
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