Hydride or carbanion attack on the triosmium cluster complexes [Os3(CO)9(µ3-η2:η2:η2-C6H5R)], R = H or Me, proceeds highly regio- and stereo-selectively at the face-capping arene ligands. The exo-addition products are anionic, triply bridging cyclohexadienyl complexes [Os3(CO)9(µ3-η2:σ:η2- C6H5RR′)]–, R′= H, Me, or Ph, that yield neutral compounds [Os3(CO)9(µ-E)(µ3-η2:σ:η2-C6H5RR′)] on reaction with electrophiles E = H+ or Au(PEt3)+.
M. A. Gallop, B. F. G. Johnson, J. Lewis and A. H. Wright, J. Chem. Soc., Dalton Trans., 1989, 481 DOI: 10.1039/DT9890000481
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