The role of alkali metal cations in MMA polymerization initiated by neutral and anionic allyl lanthanide complexes

Cheslan K. Simpson, Rosemary E. White, Christin N. Carlson, Debra A. Wrobleski, Christopher J. Kuehl, Teresa A. Croce, Ian M. Steele, Brian L. Scott, Victor G. Young, Timothy P. Hanusa, Alfred P. Sattelberger, Kevin D. John

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51 Scopus citations

Abstract

Reaction of 2 or 3 equiv of potassium 1,3-bis(trimethylsilyl)allyl (K[1,3-(SiMe 3) 2C 3H 3] = 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.

Original languageEnglish (US)
Pages (from-to)3685-3691
Number of pages7
JournalOrganometallics
Volume24
Issue number15
DOIs
StatePublished - Jul 18 2005

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