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Synfacts 2008(1): 0108-0108  
DOI: 10.1055/s-2007-991453
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart · New York

Titanocene-Functionalized Polymeric Dendrimer

Contributor(s): Yasuhiro Uozumi, Hiroe Takenaka
P. E. Berget, J. M. Teixeira, J. L. Jacobsen, N. E. Schore*
University of california, davis, USA
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Publication History

Publication Date:
18 December 2007 (online)

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Significance

Titanocene-functionalized polymeric dendrimer 8 was prepared via polymerization of styrene with the first-generation dendrimer 7 bearing titanocene and styrene groups as a cross-linking monomer (Ti loading = 0.11 mmol/g; cross­linking = 0.64%). The polymeric titanocene 8 catalyzed the reaction of PhMe2SiCl and CH2=CHMgBr to give 1,4-silylated 2-butene (PhMe2SiCH2CH=CHCH2SiMe2Ph) with TON = 158. The polymeric titanocene 9, in which the titanocene group was more directly anchored onto the PS matrix, showed much lower activity (TON = 39) in a similar catalytic reaction.