Reference of 172222-30-9, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 172222-30-9, C43H72Cl2P2Ru. A document type is Article, introducing its new discovery.
In aqueous media, two well-defined ruthenium carbene complexes [(Cy3P)2Cl2Ru=CHCH=CPh2 (1) and (Cy3P)2Cl2Ru=CHPh (2), Cy = cyclohexyl] catalyzed living ring-opening metathesis polymerization (ROMP) of functionalized norbornenes and 7-oxanorbornenes. Monomers were dispersed in water using a cationic surfactant, and polymerization was initiated by injection of a catalyst solution to yield a polymer latex. The polymerization of hydrophilic 7-oxanorbornene monomer and a hydrophobic norbornene monomer displayed similar behavior in aqueous media, with the resultant polymers having lower molecular weights relative to polymerization in anhydrous organic solution on a similar time scale. The polydispersity indices (PDIs) of polymers prepared from the hydrophilic monomer using catalyst 1 in the presence of water (PDI = 1.20) were narrower than those obtained by solution polymerization (PDI = 2.11), while PDIs for polymers prepared using catalyst 2 remained low in both the presence of water and in anhydrous solution (PDI ? 1.13). The linear relationship between molecular weight and monomer/catalyst ratios and the absence of chain transfer and termination processes indicated that these systems are indeed living. Furthermore, this new ROMP technique was shown to be an efficient method for the preparation of well-defined block copolymers.
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Reference：
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI