Remember the recycling price of ruthenium plated plates in mind, recycling price ruthenium catalyst
Why is ruthenium not used in wires? Because of the high melting point, ruthenium is not easy to forge; it is brittle and difficult to roll or pull into wires even under white heat.
Is ruthenium a thermal resistant magnet? The characteristics of ruthenium are 12.2g/cm3 in density and 2,600°C. Ruthenium is a quasi-steady state of thermal and electrical. This is a corrosion-resistant metal with a high melting point.
second generation ruthenium catalyst was the improvement of Grubbs to the first generation catalyst in 1999. Grubbs systematically studied the catalyst structure-performance relationship and found that the activity of catalyst is related to the dissociation of one of the phosphine ligands. He felt that a highly active monophosphine intermediate was passed during the catalytic cycle, and then oxidative support was carried out with olefin . According to this design concept, it is proposed to replace one of the phosphine ligands with stronger electron donation ability and higher stability with N-heterocyclic carbene ligands, thereby obtaining the second generation of Grubbs catalyst. Its active ingredients are: benzylene·[1,3-bis(trimethylphenyl)-2-imidazoline subunit]·dichloro·(tricyclohexylphosphine) ruthenium. It has higher activity and selectivity than the procatalyst and similar stability, but is sensitive to air and water, and therefore needs to be applied in nitrogen or argon inert atmosphere. Its catalytic activity is increased by 2 orders of magnitude than the first generation of catalysts. The amount used in the ring-open metathesis polymerization reaction can be reduced to one million, and the amount used in some ring-closed metathesis reactions is only 5% of 10,000. It is particularly suitable for the formation of cyclic olefins with low tension and multi-replacement olefins with large steric hindrance.
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