Dichlorotris(triphenylphosphine)ruthenium(II)

About: Dichlorotris(triphenylphosphine)ruthenium(II) is a research topic. Over the lifetime, 35 publications have been published within this topic receiving 3489 citations.

3-aminopropyl silica supported living radical polymerization of methyl methacrylate : Dichlorotris(triphenylphosphine)ruthenium(II) mediated atom transfer polymerization

Abstract: 3-Aminopropyl-functionalized silica support (APSS) has been used as a solid support for the heterogeneous atom transfer polymerization of methyl methacrylate (MMA), to poly(methyl methacrylate) (PMMA), mediated by adsorbed RuCl2(PPh3)3 as catalyst. This system displays characteristics of a living radical polymerization as indicated by (i) an increase in the number-average molecular weight (Mn) with conversion, (ii) relatively low polydispersity indexes (PDI), and (iii) linear first-order rate plots. When PMMA of Mn = 20 000 g mol-1 was targeted, the reaction reached 91% conversion after 4 h with a measured Mn = 21 500 g mol-1 and PDI = 1.49. It was found that polymerization of MMA mediated by RuCl2(PPh3)3 in the presence of APSS does not require the addition of an aluminum alkoxide (e.g., Al(OiPr)3) as an activating reagent. The rate of reaction is higher than for similar homogeneous reactions; however, the polydispersity indexes are also higher. The ruthenium content of polymers thus produced is typicall...

The mechanism of the addition of haloalkanes to alkenes in the presence of dichlorotris(triphenylphosphine)ruthenium(II), [RuCl2(PPh3)3]

Abstract: The addition of haloalkanes to alkenes in the presence of [RuCl 2 (PPh 3 ) 3 ] has been subjected to a detailed kinetic study. The results of this study, together with an examination of reaction intermediates, suggest a mechanism inolving a non-chain sequence in which [RuCl 2 (PPh 3 ) 3 ] acts as a catalyst, but which involves free radical intermediates.