Polymerization with Ruthenium Indenylidene Complexes

The ruthenium indenylidene complex XV, prepared in situ from RuCl(ri -p-cymene) (=C=C=CPh2)(PCy3)][CF3S03] Ib vith different acids showed very high activity in the cyclooctene polymerization (Table 8.2) [33]. 

The isolated complex XV and its derivatives having PiPr3 (XVI) and PPh3 (XVII) instead of PCy3 were also tested in cyclooctene polymerization at room temperature. Very good yields were obtained vhth XV and XVI (Table 8.3) [34[. 

The ruthenium indenylidene Schiff base complexes XXVIIIa and XXVIIId, synthesized by Verpoort, were evaluated in atom-transfer radical polymerization of methyl methacrylate. The polymerization was initiated by ethyl 2-bromo-2-methyl- 

Complex XXVIIIa and especially complex XXVIIId proved to be highly active catalysts for the ROMP of these olefins [61], 

Indenylidene compounds VIII, K, XXI, XXIII, XXVIIIa and XXVIIIb act as atom transfer radical polymerization catalysts for the polymerization of methyl methacrylate and styrene in high yields and with good control (Table 8.7). The catalytic activity can be dramatically improved by transforming the complexes into cationic species by treatment with AgBp4 [61]. 

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