Part 1: 1,3-Dipolar addition of activated alkyne towards coordinated azido group in ruthenium(II) complexes containing η5-cyclichydrocarbons

The indenyl and pentamethylcyclopentadienyl ruthenium(II) complexes [(η5-L3)Ru(L2)Cl] (L3 = C9H7, L2 = dppe (1a), L2 = dppm (1b); L3 = C5Me5, L2 = dppe (2a); L2 = dppm (2b) (where, dppe = Ph2PCH2CH2PPh2 and dppm = Ph2PCH2PPh2) reacts with NaN3 to yield the azido complexes [(η5-C9H7)Ru(L2)N3], L2 = dppe (3a), dppm (3b) and [(η5-C5Me5)Ru(L2)N3], L2 = dppe (4a), dppm (4b), respectively. The azido complexes undergo [3 + 2] dipolar cycloaddition reaction with dimethylacetylenedicarboxylate to yield triazole complexes [(η5-C9H7)Ru(L2)(N3C2(CO2Me)2)], L2 = dppe (5a), dppm (5b) and [(η5-C5Me5)Ru(L2)(N3C2(CO2Me)2)], L2 = dppe (6a), dppm (6b), respectively. The complexes were fully characterized on the basis of microanalyses, FT-IR and NMR spectroscopy. The crystal structures of the starting complex (1a) and representative complexes 5a, 5b and 6a have been established by single X-ray study.

Graphical abstractThe indenyl and pentamethyl-cyclopentadienyl ruthenium(II) triazole complexes can be prepared by 3 + 2 cycloaddition reaction of activated alkyne to azido ruthenium complexes of indenyland pentamethylcyclopentadienyl systems.Figure optionsDownload full-size imageDownload as PowerPoint slide