Bridging allyl ligands upon allene insertion into electron-deficient triosmium-hydride clusters [Os3(CO)9(μ3-NSC7H3R)(μ-H)] (R = H, Me)

Allene reacts with the benzothiazolide clusters [Os3(CO)9(μ3-NSC7H3R)(μ-H)] (R = H, Me) to afford the bridging allyl complexes [Os3(CO)7(μ-CO)2(μ-NSC7H3R)(μ-η1:η2:η1-CH2CHCH2)] resulting from insertion of allene into the metal–hydride. Both have been crystallographically characterized and differ with respect to the relative arrangement of allyl and benzothiazolide at the triosmium centre.

Graphical abstractReactivity of electron-deficient triosmium benzothiazolide clusters towards allene is investigated.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Reactions of electron-deficient triosmium-hydride clusters with allene. ► Insertion of allene into metal–hydride. ► Formation of bridging allyl ligand.