Reactions of [H2Os3(CO)10] with Conjugated Diynes (RC2C2R‘) Containing Nucleophilic Oxygen in β Position of a Substituent (R = Ph, R‘ = CH2OH, C(O)Ph; R = R‘ = CMe2(OH))

Reactions of [H2Os3(CO)10] with a series of diynes, RC2C2R‘ (1: R = Ph, R‘ = CH2OH; 2: R = Ph, R‘ = C(O)Ph; 3: R = R‘ = C(OH)Me2), have been studied. It was found that upon coordination to the triosmium cluster, the nucleophilic oxygens of the R‘ substituents of 1 and 2 take part in intramolecular cyclization reactions to give [HOs3(CO)10{μ-η1:η2-PhCH2(CCH−CCH−O)}] (5) and [HOs3(CO)10{μ-η1:η1-Ph(CCH−CC−O)CPh}] (6), respectively, both of …