The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Chloro(1,5-cyclooctadiene)(pentamethylcyclopentadienyl)ruthenium(SMILESS: [Cl-][Ru+2]1234567(C8(C)=C4(C)[C-]5(C)C6(C)=C87C)[CH]9=[CH]1CC[CH]2=[CH]3CC9,cas:92390-26-6) is researched.Quality Control of 2,5-Diphenyloxazole. The article 《Ruthenium-Catalyzed Azide-Alkyne Cycloaddition: Scope and Mechanism》 in relation to this compound, is published in Journal of the American Chemical Society. Let’s take a look at the latest research on this compound (cas:92390-26-6).
The catalytic activity of ruthenium(II) complexes in azide-alkyne cycloadditions were evaluated. The [Cp*RuCl] complexes, such as Cp*RuCl(PPh3)2, Cp*RuCl(COD), and Cp*RuCl(NBD), were among the most effective catalysts. In the presence of catalytic Cp*RuCl(PPh3)2 or Cp*RuCl(COD), primary and secondary azides react with a broad range of terminal alkynes containing a range of functionalities selectively producing 1,5-disubstituted 1,2,3-triazoles; tertiary azides were significantly less reactive. Both complexes also promote the cycloaddition reactions of organic azides with internal alkynes, providing access to fully-substituted 1,2,3-triazoles. The ruthenium-catalyzed azide-alkyne cycloaddition (RuAAC) appears to proceed via oxidative coupling of the azide and alkyne reactants to give a six-membered ruthenacycle intermediate, in which the first new carbon-nitrogen bond is formed between the more electroneg. carbon of the alkyne and the terminal, electrophilic nitrogen of the azide. This step is followed by reductive elimination, which forms the triazole product. DFT calculations support this mechanistic proposal and indicate that the reductive elimination step is rate-determining
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Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method