| Abstract
| - Reduction of the amide or replacement of the hydroxyl by a bromide in 2-(diphenylphosphanyl)-N-(2-hydroxyethyl)benzamide (H2PNO) yielded the compounds 2-(diphenylphosphanyl)-N-(2-hydroxyethyl)benzylamine (H2CH2PNO,1) and N-(2-bromoethyl)-2-(diphenylphosphanyl)benzamide (HPNBr, 2), respectively. Compound 2 is obtained inlow yield and, depending on the reaction conditions, is mixed with starting material or with a product which hasbeen identified as 2-(2-diphenylphosphinophenyl)oxazoline (PPh3oxaz, 3). Compounds 1 and 2 react with(NEt4)2[ReBr3(CO)3], leading to the complexes [Re(CO)3(κ2-H2CH2PNO)Br] (4) and [Re(CO)3(κ2-PPh3oxazBr)] (5),fully characterized by 1H and 31P NMR spectroscopy and X-ray crystallographic analysis. Complex 5 is the firstexample of a Re(I) tricarbonyl anchored on a phosphorus−oxazoline ligand, which has been generated during thecourse of complex formation. In the unexpected and unusual complex 5, the Re atom is stabilized by a bidentate2-(2-diphenylphosphinophenyl)oxazoline, by a bromide, and by three facially arranged carbonyl groups. In complex4, the carbonyl groups are also facially coordinated to the metal center and the other three remaining coordinationpositions are occupied by a bromide and by the bidentate (P, N) ligand 2-(diphenylphosphanyl)-N-(2-hydroxyethyl)benzylamine.
- The novel complexes [Re(CO)3(κ2-H2CH2PNO)Br] (4) and [Re(CO)3(κ2-PPh3oxaz)Br] (5), stabilized by new P, N donor ligands, were isolated and fully characterized. In the unprecedented complex 5, the metal center is anchored on a phosphorus−oxazoline ligand, generated during the course of complex formation.
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