Preparation of molybdenum pentacarbonyl complexes of the Ph2PNSO and Ph2PNSNPPh2 ligands: X-ray crystal structure and fluxional behavior of (CO)5MoP(Ph)2NSN(Ph)2PMo(CO)5

Article abstract of DOI:10.1021/om00135a038

The reactions of (CO)₅Mo(Ph₂PCI) with KNSO or K₂SN₂ in acetonitrile produce (CO)₅Mo(Ph₂PNSO) (3a) or (CO)₅MoP(Ph)₂NSN(Ph)₂PMo(CO)₅ (4a), respectively. An X-ray crystal structure determination of 4a shows that the Ph₂PNSNPPh₂ ligand adopts a cis,trans conformation. A variable-temperature ³¹P NMR spectroscopic study of 4a provides evidence for a cis,trans → trans,cis interconversion (AG^?₂₁₃ = 9.4 ± 0.2 kcal mol^-1) in solution.