Generation and reactivity of a triosmium carbon radical. Hydrogen abstraction, arene addition, and the formation of [H3Os3(CO)9(.mu.3-CCO)]2, a dialkylidyne, diketone complex

Medium- and High-nuclearity Clusters of Ruthenium and Osmium

“…17 The classification o f 'nuclearity' used here is that o f the largest contiguous group o f metal atoms. Thus, clusters held together solely by bridging sulfur-, 1 8 " 2 9 selenium-, 30 phosphorus-, 1 " 6 oxygen-, 37 " 40 arsenic-, 41 ' 42 nitrogen-3 " 5 or carbon-ligands, 46 While most examples of these reactions are mentioned below, the reader is referred to Volume 1 0 for a comprehensive discussion o f ruthenium or osmium heterometallic clusters containing copper, silver, gold, mercury, platinum, tungsten or rhodium and to Volume 1 f o r those containing boron or thallium.…”

“…77 Pyrolysis of Os3(CO) n (py) affords Os 5 30 Other pentametallic clusters with AMigands can be prepared from preformed pentametallic frameworks. H 2 Os 5 (CO) 15 reacts with pyridine in refluxing rc-octane to give Os 5 (^-H) 3 (|x-NC 5 H 4 )(CO) 14 (46), Os 5 (u-H) 2 (CO) 14 (py) (5b) and H 2 Os 5 (CO) 15 (py). 69 As in (43) and (45), the A M i g a n d in (46) is situated in the butterfly cleft.…”