Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Chemical Communications (Cambridge, United Kingdom) called Ruthenium(II)-catalyzed [2 +2 +2] cycloaddition of 1,6-diynes with electron-deficient nitriles, Author is Yamamoto, Yoshihiko; Okuda, Satoshi; Itoh, Kenji, which mentions a compound: 92390-26-6, SMILESS is [Cl-][Ru+2]1234567(C8(C)=C4(C)[C-]5(C)C6(C)=C87C)[CH]9=[CH]1CC[CH]2=[CH]3CC9, Molecular C18H28ClRu, Quality Control of Chloro(1,5-cyclooctadiene)(pentamethylcyclopentadienyl)ruthenium.
Ru(II)-catalyzed cycloaddition of 1,6-diynes with electron-deficient nitriles gave the desired bicyclic pyridines in moderate to high yields. Thus, Cp*Ru(COD)Cl-catalyzed cycloaddition of di-Me dipropargylmalonate in ClCH2CH2Cl gave 83% desired pyridine I.
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Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method