Reactions of the lightly-stabilized triosmium cluster Os3(CO)8{μ3-Ph2PCH(Me)P(Ph)C6H4}(μ-H) with two-electron donor ligands
作者： Jagodish C Sarker , Saifur Rahman , Shishir Ghosh , Graeme Hogarth , Shariff E Kabir
DOI: 10.1016/J.POLY.2020.114608
关键词:
摘要: Abstract Reactions of the lightly-stabilized Os3(CO)8{μ3-Ph2PCH(Me)P(Ph)C6H4}(μ-H) (1) with dihydrogen and representative 2-electron donor ligands, PPh3 P(OMe)3, are described. With PPh3, phosphine-adduct Os3(CO)8(PPh3){μ3-Ph2PCH(Me)P(Ph)C6H4}(μ-H) (2) is initially formed but this reacts further via three separate pathways: adding a second equivalent to yield Os3(CO)8(PPh3)2{μ-Ph2PCH(Me)PPh2} (5), losing CO ligand concomitant phosphine migration afford Os3(CO)7(PPh3){μ3-Ph2PCH(Me)P(Ph)C6H4}(μ-H) (3) or Os3(CO)9(PPh3){μ-Ph2PCH(Me)PPh2} (4). In contrast, reaction P(OMe)3 leads simple stepwise formation mono- bis-phosphite adducts, Os3(CO)8{P(OMe)3}{μ3-Ph2PCH(Me)P(Ph)C6H4}(μ-H) (6) Os3(CO)8{P(OMe)3}2{μ-Ph2PCH(Me)PPh2} (7), respectively. Addition 1 cleanly affords unsaturated 46-electron cluster Os3(CO)8{μ-Ph2PCH(Me)PPh2}(μ-H)2 (8). All new clusters have been spectroscopically characterized together single crystal X-ray diffraction studies 2, 3 8.
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