Bimetallic osmium-tin complexes: Stannylene and hydrostannylene clusters upon addition of Ph3SnH to unsaturated triosmium clusters [(μ-H)2Os3(CO)8(μ-diphosphine)] (diphosphine = dppm, dppf)

Reversible C-H bond activation at a triosmium centre: A comparative study of the reactivity of unsaturated triosmium clusters Os 3 (CO) 8 (μ-dppm)(μ-H) 2 and Os 3 (CO) 8 (μ-dppf)(μ-H) 2 with activated alkynes

“…Scheme 1 highlights the results of the reaction of cluster 1 with the two alkynes. The formation of dinuclear products in this reaction is consistent with that observed from the photochemical reaction of Os 3 (CO) 12 with DMAD [36]. Compounds 3a and 3b were the only products isolated when the same reactions were carried out in toluene at 110 °C.…”

“…In a recent contribution, we reported the reactivity of the unsaturated compounds 1 and 2 towards Ph 3 SnH, which is highly dependent on the nature of diphosphines [12]. With the rigid dppm ligand in 1, the stannylene complex Os 3 (CO) 7 (µ-SnPh 2 ) 2 (µ-dppm)(H) 2 was the major product, resulting from both Sn-H and Sn-C bond activation in addition to the minor products Os 3 (CO) 8 (SnPh 3 ) 2 (µ-dppm)(µ-H) 2 and Os 3 (CO) 8 (SnPh 3 ){µ-Ph 2 PCH 2 P(Ph)C 6 H 4 }(µ-H) 2 .…”

“…Os(CO) 4 (SnPh 3 )H, Os 2 (CO) 4 (SnPh 3 ) 2 (µ-HSnPh 2 )(µ-dppf)(µ-H) and Os 3 (CO) 8 (SnPh 3 )(µ-dppf)H(µ-H) 2 [12].…”