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Catalyst employed in the cycloaddtion of azides with acetylenes giving exclusively the 1,5-disubstitutedtriazoles in contrast to the 1,4-regiochemistry commonly observed with copper catalysis. Ruthenium catalysis also enables the use of internal acetylenes in these "click cycloaddtions". Versatile catalyst for living radical polymerization.
Tadeusz Wilczewski. Cyclopentadienyl-ruthenium and -osmium complexes: III. Chemical mechanism of dissolution of chloro(η-cyclopentadienyl)-bis(triphenylphosphine)ruthenium(II) in polar solvents. Journal of Organometallic Chemistry.1985, 297 (3), 331-340.