| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1306157 | Inorganica Chimica Acta | 2011 | 5 Pages |
Reaction of 2 equivalents of 1,3-bis-(di-tert-butylphosphinito)-2-methyl-propane (1a) with [Ir(COD)Cl]2 affords the first aliphatic diphosphinite PCP pincer complex with iridium, Ir(H){(t-Bu2POCH2)2C(Me)}Cl (2). The poor yield of 2 is partly explained by the formation of a di-nuclear byproduct [IrCl(COD)]2(μ2-{(t-Bu2POCH2)2CH(Me)}) (3). Reaction of 1,3-bis-(di-iso-propylphosphinito)-2-methyl-propane (1b) under the same condition does not give any cyclometallation, and reaction with IrCl3·H2O in DMF leads to complete decomposition of the pincer ligand under the formation of Ir(H)(i-Pr2P(OH))3(CO) (4), underpinning the comparatively low thermal stability of aliphatic phosphinite pincer systems.
Graphical abstractReaction of 1,3-bis-(di-tert-butylphosphinito)-2-methyl-propane with an iridium precursor afforded the first aliphatic diphosphinite PCP pincer complex with iridium, Ir(H){(t-Bu2POCH2)2C(Me)}Cl.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Aliphatic phosphinite pincer ligands were studied with respect to cyclometallation. ► We report the first aliphatic diphosphinite PCP pincer complex with iridium. ► Decomposition seemingly takes place with cleavage of the C–O bond.
