A comparative study of the reactivity of unsaturated triosmium clusters [Os3(CO)8{μ3-Ph2PCH2P(Ph)C6H4}(μ-H)] and [Os3(CO)9{μ3-η2-C7H3(2-Me)NS}(μ-H)] with BuNC

Cyclometalation Using d-Block Transition Metals: Fundamental Aspects and Recent Trends

“…Accordingly, low-valent osmium centers are particularly attractive for cyclometalations. The most common osmium(0) precursor, Os 3 (CO) 12 , has been used indeed frequently for activating donor-substituted arenes. – However, the ligand typically adopts a bridging μ 2 ,κ 2 coordination mode to the Os 3 core, thus forming a metallacycle including two metal centers. Only in a rare case, thermal cleavage of the osmium cluster with phenylpyridine has been observed at high temperature (180 °C) to give the monometallic complex 182 (Scheme ).…”