The Role of Alkali Metal Cations in MMA Polymerization Initiated by Neutral and Anionic Allyl Lanthanide Complexes
Organometallics2005Vol. 24(15), pp. 3685–3691
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Cheslan K. Simpson, Rosemary E. White, C.N. Carlson, Debra A. Wrobleski, C.J. Kuehl, T.A. Croce, I. M. Steele, Brian L. Scott, Victor G. Young, Timothy P. Hanusa, Alfred P. Sattelberger, Kevin D. John
Abstract
Reaction of 2 or 3 equiv of potassium 1,3-bis(trimethylsilyl)allyl (K[1,3-(SiMe3)2C3H3] = K[A‘]) with the triflate salts of Ce, Nd, Eu, Tb, and Yb gives the corresponding neutral bis-(Yb, Eu) and tris-(Ce, Nd, Tb) allyl lanthanide complexes in yields ranging from 40 to 80%. These complexes, which have been crystallographically characterized, initiate the polymerization of methyl methacrylate (MMA), but with poor turnover frequencies when compared with the corresponding salt complexes of the type K[LnA‘3]. K[A‘] itself initiates MMA polymerization, however, and its presence as an ion-pair in the salt complexes may contribute to the activity of heterometallic lanthanide catalysts.
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